An explosion north of Beirut early Sunday was caused by a gas leak, not a bomb, security officials said, contradicting their earlier statement. Nobody was injured. The explosion blew off the front door of an apartment in the town of Haret Sakhr, about 25 kilometers (16 miles) northeast of Beirut, but nobody was inside at the time, the officials said, speaking on condition of anonymity as they were not authorized to speak to the media. "The blast was not a terrorist or subversive act. It was accidental," a senior security official told The Associated Press. The interior of the apartment sustained minor damage in the blast. Earlier, security officials had said the explosion was caused by a small bomb.