Police and federal agents are searching for a man who threw a Molotov cocktail-like incendiary device inside the Ballston Common Mall. [Now found and arrested.] The man threw what was described as a “flaming bottle” from an upper level of the mall down to the food court. The device, said to be 40 ounce beer bottle, possibly containing gasoline or a similar substance, shattered on impact but did not explode, according to Arlington County Police spokesman Dustin Sternbeck. No one was injured.