Hack caused Dallas' emergency sirens to sound in error

A truck  crashed into the Ahlens department store at Drottninggatan in central Stockholm police said.
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The sirens began sounding late Friday night.

Dallas's fire dispatch and its office of emergency management pulled the plug on the sirens, after more than an hour and a half of blaring, at about 1:20 a.m.

Officials now report that the system was hacked, forcing crews to shut down the warning system that would normally alert residents to severe weather dangers.

"We shut it down as quickly as we could", Vaz said, "taking into consideration all of the precautions and protocols we had to take to make sure that we were not compromising our 156 siren system".

City spokeswoman Sana Syed said investigators believe the hack came from the Dallas area.

Locating the hacker, however, "is going to be a very long process if we do find out who actually did it", Vaz said. The city says they're trying to determine what caused the malfunction.

The incident, initially labeled a "system malfunction", sparked an avalanche of anxious posts on social media and calls to the emergency 911 system.

The city also reminded residents that they may hear sirens again as engineers determine if the system is functioning properly. They won't know the health of the sirens until the system is reactivated.

Dallas Mayor Mike Rawlings described the incident as "an attack on our emergency notification system". The initial incident prompted a wave of calls to 911 by residents anxious there was some sort of threat.

"This is yet another serious example of the need for us to upgrade and better safeguard our city's technology infrastructure", he posted on Facebook.

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