Police drones will watch over runners at this year's Boston Marathon

Two drones will buzz above a sea of 30,000 runners at this year's Boston Marathon. 

They'll hover more than a football field's distance above the starting line during the race, which takes place on April 17, and transmit surveillance video to different public safety stations.

Security has been a primary focus of race organizers since the blasts at the finish line of the 2013 Boston Marathon killed three people and injured more than 260 others. 

“It’s really something new we’re going to be using where we have a very dense population of people between the village and the start line,” said Massachusetts Emergency Management Agency Director Kurt Schwartz.  Read more...