The Israeli air force bombed four sites in the Hamas-ruled Gaza Strip on Thursday, causing no casualties, Palestinian security officials said.
The air raids came after Palestinian militants fired several mortars into southern Israel from Gaza late yesterday, wounding one person, the military said.
"There were four or five mortars that landed near Kerem Shalom," an army spokeswoman said, adding that one Israeli was moderately wounded.
Militants also fired a rocket which hit an empty house, the army said.
The air strikes hit three sites in central Gaza and one on the outskirts of Gaza City, Palestinian officials said.
The military confirmed it had targeted a weapons-making and arms storage facility in central Gaza, and had also attacked two "terror hubs" in the north of the territory in response to the rocket fire.
According to an Israeli army count, Palestinian militants have fired more than 200 rockets or mortar rounds at the Jewish state from the coastal strip since the start of this year.