The Israeli army says it carried out airstrikes on a weapons workshop east of Gaza City and two weapons smuggling tunnels under the Gaza-Egypt border.
Palestinian health officials reported no injuries. The army says Saturday's strikes were in response to one mortar shell and one rocket fired at Israel from Gaza the day before. A small, extremist militant group, Ansar al-Sunna, said on Friday it fired two rockets at Israel.
Exchanges of fire between Israel and Gazan militant groups has increased slightly in recent months after a period of relative quiet following Israel's Gaza offensive, which ended Jan. 18. The Israeli army said about 60 rockets and mortars have been fired at Israeli in the last three months. Airstrikes have followed some of these.