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Drones will hover runners at this year's Boston Marathonby Circa News

If you're running this year's Boston Marathon, you might notice something different.

Two drones will hover above nearly 30,000 runners during the historic race, and transmit surveillance video to law enforcement officials, Mashable reported. The tightened security comes three years after the Boston bombings, which claimed the lives of three people and injured more than 200.

Kurt Schwartz, the Massachusetts emergency management agency director, said: "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."

The drones are intended to keep a careful eye on areas near the starting line, as well as the makeshift "village" where runners tend to gather before the race.

The bots, however, will be tethered to cables to avoid crashes. Despite being anchored, they will have the capability to zoom in on people and follow specific targets.

The drones were made by a commercial drone company, which deployed the bots at last year's Tokyo Marathon.

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