US Homeland Security chief to introduce new terrorism alert system

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New Homeland Security Warning System Created

WASHINGTON (Reuters) -- U.S. Homeland Security Secretary Jeh Johnson said on Monday that he would soon announce changes to the national alert system to warn the public about terrorism risks.

The changes come amid fresh concerns about terrorism in the United States after last Wednesday's shooting in San Bernardino, California, although they were not specifically prompted by it. President Barack Obama has called the shooting, in which 14 people were killed, an act of terrorism.

Johnson proposed revising the alert system after five U.S. service members in Chattanooga, Tennessee, were killed in July in a shooting that has also been investigated as terrorism.

See photos of the Chattanooga shooting below:

28 PHOTOS
Tennessee Naval Center shooting
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US Homeland Security chief to introduce new terrorism alert system
CHATTANOOGA, TN - JULY 16: Evidence markers sit on the ground at the scene of a shooting in the parking lot of the Armed Forces Career Center/National Guard recruitment office on July 16, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images)
This April 2015 booking photo released by the Hamilton County Sheriffs Office shows a man identified as Mohammad Youssduf Adbulazeer after being detained for a driving offense. A U.S. official speaking on condition of anonymity identified the gunman in shootings at two Chattanooga military facilities as Muhammad Youssef Abdulazeez, who shares the same age and address as the man in the photo. (Hamilton County Sheriffs Office via AP)
CHATTANOOGA, TN - JULY 16: An angel statue sits in a makeshift memorial near the scene of a shooting at a Armed Forces Career Center/National Guard recruitment office on July 16, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images)
CHATTANOOGA, TN - JULY 16: Zach, Zoe and Melissa Cates add to a makeshift memorial near the scene of a shooting at a Armed Forces Career Center/National Guard recruitment office on July 16, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images)
CHATTANOOGA, TN - JULY 16: A makeshift memorial is sits outside of the scene of a shooting at a Armed Forces Career Center/National Guard recruitment office on July 16, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images)
CHATTANOOGA, TN - JULY 16: Chattanooga Mayor Andy Burke (R) speaks as Tennessee Gov. Bill Haslam (L) and Chattanooga Police Chief Fred Fletcher (2nd L) listen during a press conference at the 911 Communications Center on July 16, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images)
CHATTANOOGA, TN - JULY 16: Chattanooga Police Chief Fred Fletcher during a press conference at the 911 Communications Center on July 16, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images)
CHATTANOOGA, TN - JULY 16: Chattanooga Police Chief Fred Fletcher (R) speaks as Chattanooga Mayor Andy Burke (L), Tennessee Governor Bill Haslam (2nd L) listen during a press conference at the 911 Communications Center on July 16, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images)
CHATTANOOGA, TN - JULY 16: Tennessee Gov. Bill Haslam speaks during a press conference at the 911 Communications Center on July 16, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images)
CHATTANOOGA, TN - JULY 16: Bullet holes are seen in the glass of a Armed Forces Career Center/National Guard recruitment office on July 16, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images)
CHATTANOOGA, TN - JULY 16: Members of the FBI Evidence Response Team work the scene of a shooting in the parking lot of the Armed Forces Career Center/National Guard recruitment office on July 16, 2015 in Chattanooga, Tennessee. According to reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images)
An investigator searches under a vehicle parked outside an Armed Forces Career Center,Thursday, July 16, 2015, in Chattanooga, Tenn. A gunman opened fire outside the building Thursday morning. (AP Photo/John Bazemore)
In this frame from video, law enforcement officers surround a house in Hixson, Tenn., Thursday, July 16, 2015. A gunman unleashed a barrage of fire at two sites a few miles apart in Chattanooga, killing several, officials said. The attacker was also killed. (AP Photo/Alex Sanz)
The windows of the Armed Forces Recruitment Center have several bullet holes from a shooting as the area is cordoned off with blue shell casing markers in the parking lot on Thursday, July 16, 2015 in Chattanooga, Tenn. At least two military facilities in Tennessee were attacked in shootings Thursday. (Tim Barber/Chattanooga Times Free Press via AP)
US President Barack Obama (L) speaks during a meeting with FBI Director James Comey (R) in the Oval Office of the White House in Washington, DC, on July 16, 2015, on the shooting in Chattanooga, Tennessee. US President Barack Obama said the 'heartbreaking' shootings in Chattanooga that killed four Marines appeared to be the work of a lone gunman. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
A police officer investigates outside the Armed Forces Career Center after a gunman opened fire on the building Thursday, July 16, 2015, in Chattanooga, Tenn. Authorities say there were multiple casualties including the gunman. (AP Photo/John Bazemore)
Map locates two shooting sites. (via AP)
Police officers enter the Armed Forces Career Center through a bullet-riddled door after a gunman opened fire on the building Thursday, July 16, 2015, in Chattanooga, Tenn. Authorities say there were multiple casualties including the gunman. (AP Photo/John Bazemore)
Tennessee Highway Patrol Trooper Paul Clendenen guards the top of the C.B. Robinson Bridge at Amnicola Highway after a morning shooting near the Naval Reserve Center, in Chattanooga, Tenn. on Thursday, July 16, 2015.Chattanooga Mayor Andy Berke said there's "an officer down" at a military reserve center. (Tim Barber/ChattanoogaTimes Free Press via AP)
In this image made from video and released by WRCB-TV, authorities work an active shooting scene on amincola highway near the Naval Reserve Center, in Chattanooga, Tenn. on Thursday, July 16, 2015. Chattanooga Mayor Andy Berke says police are pursuing an active shooter after reports of a shooting at the military reserve center. (WRCB-TV via AP) 
In this image made from video and released by WRCB-TV, authorities work an active shooting scene on amincola highway near the Naval Reserve Center, in Chattanooga, Tenn. on Thursday, July 16, 2015. Chattanooga Mayor Andy Berke says police are pursuing an active shooter after reports of a shooting at the military reserve center. (WRCB-TV via AP)
A highway patrolman stands guard atop the C.B. Robinson Bridge as police and emergency vehicles crowd Amnicola Highway after a morning shooting near the Naval Reserve Center, in Chattanooga, Tenn. on Thursday, July 16, 2015. Chattanooga Mayor Andy Berke said there's "an officer down" at a military reserve center. (Tim Barber/Chattanooga Times Free Press via AP)
Police and emergency vehicles block Amnicola Highway after a morning shooting near the Naval Reserve Center, in Chattanooga, Tenn. on Thursday, July 16, 2015. Chattanooga Mayor Andy Berke said there's "an officer down" at a military reserve center. (Tim Barber/Chattanooga Times Free Press via AP)
Reserve Recruitment personnel stand outside a Navy recruiting building as the area is cordoned off with blue shell casing markers in the parking lot on Thursday, July 16, 2015 in Chattanooga, Tenn. At least two military facilities in Tennessee were attacked in shootings Thursday, including one at a Navy recruiting building, officials said. (Tim Barber/Chattanooga Times Free Press via AP)
Chattanooga police talk to Reserve Recruitment Center personnel at the Lee Hwy office as the area is cordoned off with blue shell casing markers in the parking lot on Thursday, July 16, 2015 in Chattanooga, Tenn. At least two military facilities in Tennessee were attacked in shootings Thursday, including one at a Navy recruiting building, officials said. (Tim Barber/Chattanooga Times Free Press via AP) 
Store employees look out their door next to the Reserve Recruitment Center as the area is cordoned off after a shooting on Thursday, July 16, 2015 in Chattanooga, Tenn. At least two military facilities in Tennessee were attacked in shootings Thursday, including one at a Navy recruiting building, officials said. (Tim Barber/ChattanoogaTimes Free Press via AP)
In this image made from video and released by WRCB-TV, authorities work an active shooting scene on amincola highway near the Naval Reserve Center, in Chattanooga, Tenn. on Thursday, July 16, 2015. Chattanooga Mayor Andy Berke says police are pursuing an active shooter after reports of a shooting at the military reserve center. (WRCB-TV via AP) 
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"We need to get ... to a new system with an intermediate level," Johnson said at a security forum on Monday, adding he planned to outline specific changes in the coming days.

The National Terrorism Advisory System is triggered by specific, credible information on a possible threat. The NTAS in 2011 replaced a color-coded alert system, but Johnson said more changes were needed.

Johnson said the NTAS system had such a high bar for alerts that the government never used it. Security officials need to do a better job of informing the public about global terrorist threats and providing guidance, he added.

A DHS official said later that the move will involve changes to the existing NTAS system but not be a new system.

Related: See inside the San Bernardino suspects' apartment:

32 PHOTOS
Inside San Bernardino shooting suspects home
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US Homeland Security chief to introduce new terrorism alert system
REDLANDS, CA - DECEMBER 4: Inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly the recent mass shootings, lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A Quran sits in the living room inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: An identification card for Syed Farook inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A hole in the ceiling could be seen inside the closet area of the rear bedroom inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A baby crib is seen inside the baby room of the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings, lived, on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A firearm lubricant could be seen in the closet of the front bedroom inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: Media reporters go in and out of the townhouse where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A praying mat and a cleared out closet in the baby room in the front of the apartment. A rare first glimpse inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly the recent mass shootings, lived, on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: Prayer beads are seen laying on the bed alongside personal documents in the rear bedroom inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A closet inside the baby room. A rare first glimpse inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings, lived, on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
REDLANDS, CA - DECEMBER 4: A rare first glimpse inside the house where Syed Rizwan Farook and Tafsheen Malik, suspects of the deadly recent mass shootings, lived on December 4, 2015 in Redlands, California. (Photo by Marcus Yam/Los Angeles Times via Getty Images)
A book sits on a table inside the home of San Bernardino mass murder suspect Syed Farook, December 4, 2015 in Redlands, California. The community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. AFP PHOTO / ROBYN BECK / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
Journalists squeeze into a child's bedroom in the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. AFP PHOTO / ROBYN BECK / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
A view of the kitchen inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. AFP PHOTO / ROBYN BECK / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
A television crew prepares to do a live report inside a child's bedroom in the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. AFP PHOTO / ROBYN BECK / AFP / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 04: Reporters take pictures of photographs found inside the home of shooting suspect Syed Farook on December 4, 2015 in San Bernardino, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: Baby food sits on a kitchen counter inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: A hatchet sits in a kitchen drawer inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: Reporters inspect the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: Arabic books sit in a closet inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: An Islamic Manners book sits in a bedroom inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: A book about prayer sits on a bedside table inside the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
SAN BERNARDINO, CA - DECEMBER 04: Reporters inspect the home of shooting suspect Syed Farook on December 4, 2015 in San Bernardino, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: Reporters inspect the home of shooting suspect Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
REDLANDS, CA - DECEMBER 04: Reporters inspect the home of Syed Farook on December 4, 2015 in Redlands, California. The San Bernardino community is mourning as police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 21 injured. (Photo by Justin Sullivan/Getty Images)
Members of the media crowd into the apartment bedroom of San Bernardino shooting suspects Syed Farook and his wife, Tashfeen Malik, in Redlands, Calif., Friday, Dec. 4, 2015, after the building landlord invited journalists into the townhouse. A book containing passages from the Quran is seen at right. (AP Photo/Chris Carlson)
Members of the media crowd into a child's room in an apartment in Redlands, Calif., shared by San Bernardino shooting rampage suspects Syed Farook and his wife, Tashfeen Malik, Friday, Dec. 4, 2015, after the building landlord invited media into the townhouse rented by the California attackers. (AP Photo/Chris Carlson)
Members of the media crowd into the living room of an apartment in Redlands, Calif., shared by San Bernardino shooting rampage suspects Syed Farook and his wife, Tashfeen Malik, Friday, Dec. 4, 2015, after the building landlord invited media into the townhouse rented by the California attackers. (AP Photo/Chris Carlson)
Members of the media crowd into the living room of an apartment in Redlands, Calif., shared by San Bernardino shooting rampage suspects Syed Farook and his wife, Tashfeen Malik, Friday, Dec. 4, 2015, after the building landlord invited media into the townhouse rented by the California attackers. (AP Photo/Chris Carlson)
Members of the media crowd into a child's room in an apartment in Redlands, Calif., shared by San Bernardino shooting rampage suspects Syed Farook and his wife, Tashfeen Malik, Friday, Dec. 4, 2015, after the building landlord invited media into the townhouse rented by the California attackers. (AP Photo/Chris Carlson)
A member of the media films a wall tapestry displaying religous writing in the living room of an apartment in Redlands, Calif., shared by San Bernardino shooting rampage suspects Syed Farook and his wife, Tashfeen Malik, Friday, Dec. 4, 2015, after the building landlord invited media into the townhouse rented by the California attackers. (AP Photo/Chris Carlson)
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