Subway explosion reportedly caused by pranksters

Video posted online shows an explosion on subway tracks just as a C train pulls into the Nostrand Ave. station in Bedford-Stuyvesant, Brooklyn. Gothamist reports that a group of teens, wanted in an earlier prank, put a subway sign on the tracks. The incident occurred on Thursday at about 8:15 a.m. It affected service for more than an hour during the morning commute.