Israeli aircraft bombed four targets in the Gaza Strip before sunrise Friday.

No injuries were reported in the attack that came a day after a Palestinian faction launched seven mortar shells into Israeli territory.

Two airstrikes in the north and another two in the south caused severe structural damage to buildings in Jabaliya and Beit Hanoun, while two smuggling tunnels were destroyed near Rafah, security officials in Gaza said. F16 jet fighters hit twice in the north, outside residential areas in an industrial zone.

An Israeli military spokeswoman said three sites were targeted, two "terror tunnels" in the south and a single weapons cache in the north. The army said the strikes were in retaliation for recent projectile fire from Gaza.