Homeland Security chief: No known threat of Brussels-type attack in US

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WASHINGTON, March 22 (Reuters) - U.S. Secretary of Homeland Security Jeh Johnson said on Tuesday that the United States has no intelligence that indicates there is a plot to carry out an attack inside U.S. borders similar to the one in Brussels.

SEE ALSO: Brussels residents open their doors to offer shelter after attacks

"At present, we have no specific, credible threat of any plot to conduct similar attacks here in the United States," Johnson said in a statement.

Johnson added that the Transportation Security Administration is ramping up security in major city airports and rail and transit stations throughout the United States.

See photos of stepped-up security in the U.S.:

29 PHOTOS
Brussels Attacks: Domestic security response
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Homeland Security chief: No known threat of Brussels-type attack in US
NEW YORK, NY - MARCH 22: Heavily armed police patrol the streets in lower Manhattan following a heightened terror alert after attacks in the Belgian capital of Brussels on March 22, 2016 in New York City. Dozens are thought to have been killed after numerous bombs were set off at the Brussels airport and Metro. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - MARCH 22: Heavily armed police patrol the streets in lower Manhattan following a heightened terror alert after attacks in the Belgian capital of Brussels on March 22, 2016 in New York City. Dozens are thought to have been killed after numerous bombs were set off at the Brussels airport and Metro. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - MARCH 22: Heavily armed police patrol the streets in lower Manhattan following a heightened terror alert after attacks in the Belgian capital of Brussels on March 22, 2016 in New York City. Dozens are thought to be killed after numerous bombs were set off at the Brussels airport and Metro. (Photo by Spencer Platt/Getty Images)
New York Police Department (NYPD) officers stand guard in Times Square on March 22, 2016, in New York. New York and Washington stepped up security in the wake of the attacks in Brussels on March 22, deploying counter-terrorism reinforcements and the National Guard to airports and stations, officials said. The New York Police Department (NYPD) said there was no indication that the attacks in Belgium were connected to New York, but ordered the steps as America's biggest city of 8.4 million began the morning commute. Around 35 people were killed and more than 200 wounded on Tuesday in bombings at the Brussels airport and a metro station in the city that is home to the European Union and NATO. / AFP / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
New York Police Department (NYPD) officers stand guard in Times Square on March 22, 2016, in New York. New York and Washington stepped up security in the wake of the attacks in Brussels on March 22, deploying counter-terrorism reinforcements and the National Guard to airports and stations, officials said. The New York Police Department (NYPD) said there was no indication that the attacks in Belgium were connected to New York, but ordered the steps as America's biggest city of 8.4 million began the morning commute. Around 35 people were killed and more than 200 wounded on Tuesday in bombings at the Brussels airport and a metro station in the city that is home to the European Union and NATO. / AFP / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
A New York Police Department (NYPD) officer patrols in Times Square on March 22, 2016, in New York. New York and Washington stepped up security in the wake of the attacks in Brussels on March 22, deploying counter-terrorism reinforcements and the National Guard to airports and stations, officials said. The New York Police Department (NYPD) said there was no indication that the attacks in Belgium were connected to New York, but ordered the steps as America's biggest city of 8.4 million began the morning commute. Around 35 people were killed and more than 200 wounded on Tuesday in bombings at the Brussels airport and a metro station in the city that is home to the European Union and NATO. / AFP / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
A New York Police Department (NYPD) officer patrols in Times Square on March 22, 2016, in New York. New York and Washington stepped up security in the wake of the attacks in Brussels on March 22, deploying counter-terrorism reinforcements and the National Guard to airports and stations, officials said. The New York Police Department (NYPD) said there was no indication that the attacks in Belgium were connected to New York, but ordered the steps as America's biggest city of 8.4 million began the morning commute. Around 35 people were killed and more than 200 wounded on Tuesday in bombings at the Brussels airport and a metro station in the city that is home to the European Union and NATO. / AFP / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
New York Police Department (NYPD) officers patrol in Times Square on March 22, 2016, in New York. New York and Washington stepped up security in the wake of the attacks in Brussels on March 22, deploying counter-terrorism reinforcements and the National Guard to airports and stations, officials said. The New York Police Department (NYPD) said there was no indication that the attacks in Belgium were connected to New York, but ordered the steps as America's biggest city of 8.4 million began the morning commute. Around 35 people were killed and more than 200 wounded on Tuesday in bombings at the Brussels airport and a metro station in the city that is home to the European Union and NATO. / AFP / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
New York Police Department (NYPD) officers stand guard in Times Square on March 22, 2016, in New York. New York and Washington stepped up security in the wake of the attacks in Brussels on March 22, deploying counter-terrorism reinforcements and the National Guard to airports and stations, officials said. The New York Police Department (NYPD) said there was no indication that the attacks in Belgium were connected to New York, but ordered the steps as America's biggest city of 8.4 million began the morning commute. Around 35 people were killed and more than 200 wounded on Tuesday in bombings at the Brussels airport and a metro station in the city that is home to the European Union and NATO. / AFP / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
NEW YORK, NY - MARCH 22: Heavily armed police patrol the streets in lower Manhattan following a heightened terror alert after attacks in the Belgian capital of Brussels on March 22, 2016 in New York City. Dozens are thought to be killed after numerous bombs were set off at the Brussels airport and Metro. (Photo by Spencer Platt/Getty Images)
A pair of Metro-North Railroad Police officers patrol in New York's Grand Central Terminal, Tuesday, March 22, 2016. Authorities are increasing security throughout New York City following explosions at the airport and subway system in the Belgian capital of Brussels. (AP Photo/Richard Drew)
Out in full force. Protecting NYC with the #Belgiumattack in mind. Rest assured we are prepared. https://t.co/SRLwsYxihn
#LAXPD has increased patrol in all terminals. Report Suspicious Activity To The Police. https://t.co/aKfOsyY3q3
BREAKING: NYPD to ramp up security at mass transit points, bridges & tunnels, and other landmarks following today's attacks in Brussels.
Full statement on the #Belgium terror attacks. Stepping up NYPD patrols in transit & high profile areas in NYC. https://t.co/BCvrJIH5ZO
Explosions in #Brussels - Always stay alert. If you see something, say something. (888)NYC-SAFE https://t.co/or1qVjY0ZK
NYPD steps up security at @TimesSquareNYC due to Brussels attacks https://t.co/AcKgK8uaaP
DHS will not hesitate to adjust our security posture, as appropriate, to protect the American people. #Brussels
DHS is closely monitoring the unfolding events in #Brussels and we remain in contact with our counterparts in the region.
Heavy police presence and k9 In penn station
Seeing cops in riot gear w/ automatic rifles as I get off at Penn Station. Times like this I hate working close to a landmark. Be safe.
STAY STRONG #BRUSSELS. OUR HEARTS ARE WITH YOU-- https://t.co/yBJ1dGhgiD
Transit Police, including bomb dogs, conducting extra patrols on MAX and transit stations after #Brussels🇧🇪 attack. No known threat to #PDX.
LOS ANGELES, CA - MARCH 22: LAX airport police officers with automatic weapons patrol near the Tom Bradley International Terminal March 22, 2016 in Los Angeles, California. A terrorist attack in Brussels has put law enforcement on high alert in Los Angeles despite no specific threats. (Photo by Brian van der Brug/Los Angeles Times via Getty Images)
LOS ANGELES, CA - MARCH 22: Los Angeles County sheriff's transit police stand by the entrance to the Metro Red and Purple lines in Los Angeles Tuesday morning, March 22, 2016, as an added measure of security following terrorist attacks in Brussels. (Photo by Irfan Khan/Los Angeles Times via Getty Images)
LOS ANGELES, CA - MARCH 22: LAX airport police officer Cortinas keeps watch at Terminal Two March 22, 2016 in Los Angeles, California. A terrorist attack in Brussels has put law enforcement on high alert in Los Angeles despite no specific threats. (Photo by Brian van der Brug/Los Angeles Times via Getty Images)
LOS ANGELES, CA - MARCH 22: Los Angeles County sheriff's transit police patrol Union Station in downtown Los Angeles Tuesday morning, March 22, 2016, as an added measure of security following terrorist attacks in Brussels. (Photo by Irfan Khan/Los Angeles Times via Getty Images)
LOS ANGELES, CA - MARCH 22: Los Angeles County sheriff's transit police stand by the entrance to the Metro Red and Purple lines in Los Angeles Tuesday morning, March 22, 2016, as an added measure of security following terrorist attacks in Brussels. (Photo by Irfan Khan/Los Angeles Times via Getty Images)
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