An explosion at a funeral procession on Friday killed two people and injured at least 30 others, as hundreds of mourners marched through Gaza City, hospital officials said. Witnesses said gunmen were firing in the air during the funeral of a Palestinian Fatah terrorist, who was killed Thursday in an Israeli air strike following a Kassam rocket attack on Israel. Then, a powerful explosion went off. The source of the blast was unknown and it was unclear if the device was triggered or set off accidentally. Hamas security officials said a participant in the funeral lobbed a pipe bomb at the edges of the procession, but the bomb bounced back into the procession, causing the mayhem. Jpost.com staff contributed to this report.