Video surveillance helped authorities track down the Boston Marathon bombers and they could be used (and are being used) to thwart future attempts at attacks.

I was intrigued by this story because it revealed that we have a sophisticated weapon to help keep us safe and it's proven to be quite effective.

In New York, authorities say they have high-tech smart-camera surveillance that has prevented attacks before they could be launched over the last decade.

According to today.com:

“We’ve had 16 plots against the city since Sept. 11, and none has succeeded,” New York Police Department Commissioner Ray Kelly said in a segment that aired Tuesday on TODAY.

Kelly also said the artificial intelligence technology used in the city's 4,000 cameras can detect abnormal or suspicious behavior, such as when a person abandons a backpack, and then immediately alert police.