Israeli troops sprayed bullets at a group of Hamas members laying explosives along paths used by Israeli tanks in a Gaza neighbourhood, triggering a shootout that killed 2 militants and a bystander. For more than a week, Israeli troops backed by attack helicopters and tanks have fought pitched battles with Palestinian gunmen in an operation meant to destroy tunnels used to smuggle weapons across the Egyptian border into southern Gaza. In Saturday's fighting, troops fired on militants laying explosives along tank routes in the Salam neighborhood of the Rafah refugee camp, the army and Hamas members said.