Israel says Palestinian militants have fired a new barrage of rockets and mortars from Gaza.

No one was injured in Thursday's attack on southern Israel, but it raises new concerns that an increasingly shaky five-month-old truce might collapse. The army says five rockets and two mortars were launched.

The truce began to unravel last week, after Israeli forces trying to destroy a militants' tunnel entered Gaza, setting off battles that killed seven Palestinian gunmen. The fighting unleashed a wave of rocket attacks from Gaza at Israeli border towns and Israel closed its border crossings with Gaza in response.