An explosion was heard at an Israeli-Gaza crossing point after dark on Tuesday, but there were casualties in the area, an Israeli rescue service said, according to Reuters. The source of the blast was not clear. The site is a frequent source of Israeli-Palestinian violence. The Israeli army was still checking the reports. Zaka, the Israeli rescue service that reported the explosion, said minutes later that nobody was hurt in the incident. Palestinian medics in Gaza also said they had had no word of any casualties.