Explosion in a four-story building in the Narmak neighborhood in Tehran An explosion occurred on the fourth floor of a four-story building in the Narmak neighborhood, located in eastern Tehran. The spokesman for the fire department announced that the building was empty at the time of the accident and no injuries were reported. Based on the official initial assessment, the cause of the gas leak accident was announced; However, some sources also claimed that the explosion occurred after a UAV hit. So far, official sources have not confirmed this claim. M.A.