Computer hack sets off 156 emergency sirens across Dallas

April 8 (Reuters) - A computer hack set off all the emergency sirens in Dallas for about 90 minutes overnight in one of the largest known breaches of a siren warning system, officials in the Texas city said on Saturday.

Dallas' 156 sirens, normally used to warn of tornadoes and other dangerous weather, were triggered at 11:42 p.m. CDT on Friday. The wailing did not end until 1:17 a.m. CDT on Saturday when engineers manually shut down the sirens' radio system and repeaters, city Emergency Management Director Rocky Vaz said.

"At this point, we can tell you with a good deal of confidence that this was somebody outside of our system that got in there and activated our sirens," he told reporters.

The breach in the city of 1.6 million people was believed to have originated in the area, city spokeswoman Sana Syed said in an emailed statement.

Vaz cited industry experts as saying the hack was among the largest ever to affect emergency sirens, with most breaches triggering one or two. "This is a very, very rare event," he said.

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Severe weather in the US 2017 -- tornadoes, snowstorms, flooding, hail
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Severe weather in the US 2017 -- tornadoes, snowstorms, flooding, hail
Abdel Salah, the owner of Sam's Food and Liquor Store surveys damage after a series of tornados tore through in New Orleans, Louisiana, U.S., February 8, 2017. REUTERS/Ben Depp
Heavy thunderstorm clouds fill the sky over Center City Philadelphia, PA, on Feb. 25, 2017. (Photo by Bastiaan Slabbers/NurPhoto via Getty Images)
Residents clear their cars and street of snow in Weehawken, New Jersey, as the One World Trade Center and lower Manhattan are seen after a snowstorm in New York, U.S. March 14, 2017. REUTERS/Eduardo Munoz TPX IMAGES OF THE DAY TPX IMAGES OF THE DAY
PERRYVILLE, MO - MARCH 01: A utility pole was downed during last night's tornado on March 1, 2017 in Perryville, Missouri. At least one person was killed when the tornado crossed interstate 55. (Photo by Jon Durr/Getty Images)
Birds sit on some branches in Central Park in New York on March 14, 2017. Winter Storm Stella dumped sleet and snow across the northeastern United States on Tuesday but spared New York from the worst after authorities cancelled thousands of flights and shut schools. Blizzard warnings were in effect in parts of Connecticut, Massachusetts and upstate New York, but were lifted for New York City, the US financial capital home to 8.4 million residents, where snow turned to sleet, hail and rain. / AFP PHOTO / Eric BARADAT (Photo credit should read ERIC BARADAT/AFP/Getty Images)
PERRYVILLE, MO - MARCH 01: A house along Pcr 906 is destroyed after last night's tornado on March 1, 2017 in Perryville, Missouri. At least one person was killed when the tornado crossed interstate 55. (Photo by Jon Durr/Getty Images)
Heavy thunderstorm clouds fill the sky over Center City Philadelphia, PA, on Feb. 25, 2017. (Photo by Bastiaan Slabbers/NurPhoto via Getty Images)
PERRYVILLE, MO - MARCH 01: A shed for farm equipment on Pcr 906 collapsed and metal sheeting was tangled in trees after last night's tornado, on March 1, 2017 in Perryville, Missouri. At least one person was killed when the tornado crossed interstate 55. (Photo by Jon Durr/Getty Images)
PERRYVILLE, MO - MARCH 01: A house and garage were destroyed on Hwy V after last night's tornado on March 1, 2017 in Perryville, Missouri. At least one person was killed when the tornado crossed interstate 55. (Photo by Jon Durr/Getty Images)
A resident clears the street of snow in Weehawken, New Jersey, as the Empire State Building and Middle Manhattan are seen after a snowstorm in New York, U.S. March 14, 2017. REUTERS/Eduardo Munoz
Debris covers a street in New Orleans East after a series of tornados tore through New Orleans and other parts of Louisiana, leaving trees, power lines and homes and businesses leveled, in New Orleans, Louisiana, U.S., February 8, 2017. REUTERS/Ben Depp
Tien Nguyen cleans up debris in "Q" Nail studio on Chef Menteur highway which he and his wife own, they survived the tornado by sheltering in the bathroom, a tornados tore through New Orleans and other parts of Louisiana, leaving trees, power lines and homes and businesses leveled, in New Orleans, Louisiana, February 8, 2017. REUTERS/Ben Depp
Two snowmen sit in Central Park in New York on March 14, 2017. Winter Storm Stella dumped sleet and snow across the northeastern United States on Tuesday but spared New York from the worst after authorities cancelled thousands of flights and shut schools. Blizzard warnings were in effect in parts of Connecticut, Massachusetts and upstate New York, but were lifted for New York City, the US financial capital home to 8.4 million residents, where snow turned to sleet, hail and rain. / AFP PHOTO / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
Trailers lie on their sides behind a Procter and Gamble warehouse after a tornado ripped through the area on Sunday in Albany, Georgia, U.S. January 24, 2017. REUTERS/Tami Chappell
A snowplow clears snow in Times Square during a snowstorm in the Manhattan borough of New York, U.S. March 14, 2017. REUTERS/Carlo Allegri
A gas sign from a gas station sits in a tree nearby after a tornado ripped through the area on Sunday in Albany, Georgia, U.S. January 24, 2017. REUTERS/Tami Chappell
Friends used there snow day to go sledding on a hill at 47th street northwest and Massachusetts Avenue in Washington on March 14, 2017. Winter Storm Stella dumped sleet and snow across the northeastern United States on Tuesday but spared New York from the worst after authorities cancelled thousands of flights and shut schools. Blizzard warnings were in effect in parts of Connecticut, Massachusetts and upstate New York, but were lifted for New York City, the US financial capital home to 8.4 million residents, where snow turned to sleet, hail and rain. / AFP PHOTO / Tasos Katopodis (Photo credit should read TASOS KATOPODIS/AFP/Getty Images)
A police car pushes a cab stuck on a snow and sleet-covered street in New York on March 14, 2017. Winter Storm Stella dumped sleet and snow across the northeastern United States on Tuesday but spared New York from the worst after authorities cancelled thousands of flights and shut schools. Blizzard warnings were in effect in parts of Connecticut, Massachusetts and upstate New York, but were lifted for New York City, the US financial capital home to 8.4 million residents, where snow turned to sleet, hail and rain. / AFP PHOTO / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
The Rustic Barn, an event hall, which suffered major tornado damage, is seen from an unmanned aerial vehicle in Canton, Texas, April 30, 2017. REUTERS/Brandon Wade TPX IMAGES OF THE DAY
Homeowners clean up debris after a tornado hit the town of Emory, Texas, U.S. April 30, 2017. REUTERS/Brandon Wade
Homes are severely damaged after a tornado hit the town of Emory, Texas, U.S. April 30, 2017. REUTERS/Brandon Wade
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Engineers are working to restart the system and should have it restored by late on Sunday, he said. Until the sirens are running, Dallas will rely on local media, emergency 911 phone calls, and a federal radio alert system, Vaz said.

The hack is being investigated by system engineers and the Federal Communications Commission has been contacted, but police have not been involved, he said.

The sirens went through 15 cycles of a 90-second activation before they were shut down, he said.

The wailing sirens triggered a firestorm of speculation and reaction on Twitter, with Garrett S. Bacak at @theinsidiousone tweeting, "Go home dallas, you're drunk."

Glynn Wilcox wrote on @glynnwilcox, "At this point I'm never trusting a #siren again."

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