Israeli warplanes launched six overnight raids on the Islamist-run Gaza Strip, Palestinian security officials and witnesses said, adding that nobody was wounded in the attacks.
An Israeli military spokesman said on Saturday only that two air raids had taken place, and that they targeted a tunnel in the south linking Gaza to Israel and a weapons workshop in the north.
The Palestinian sources said Israel carried out five air strikes in the southern part of Gaza near Rafah and the border with Egypt, as well as a sixth raid east of Gaza City.
Most of the tunnels dug by the Palestinians to evade the Israeli blockade connect the enclave with Egypt, but some also run to Israel, which says they are used by militants to launch attacks.
The Israeli spokesman said the raids were launched in response to recent rocket attacks from Gaza.
The enclave has been mostly quiet since the end of a devastating 22-day Israeli offensive in January 2009, but the past week has seen several incidents along the heavily guarded border.