JERUSALEM (JTA) — A bomb exploded on a public bus in Bat Yam.

Passengers had already been removed from the bus when it blew up on Sunday afternoon. Passengers had alerted the bus driver to a suspicious package left on the bus.

The bomb detonated as a police sapper was working to defuse it. The police sapper was injured in the explosion.

It is unclear if the bomb was a terror attack or criminal in nature. Police sources told the Times of Israel that it appeared to be a terror attack.