An Israeli helicopter gunship fired at least two missiles at a car in the Nusseirat refugee camp in central Gaza tonight, killing two Islamic militants and wounding 25, witnesses said.
The attack followed three other air attacks on targets in Gaza earlier in the day in which killed two militants and a bystander were killed.
An explosion was heard in the city and helicopters seen over head a short time ago, but there were no immediate reports of a target or casualties.
An Israeli helicopter gunship fired at least one missile at a car in Gaza earlier this morning, killing two members of the militant Hamas movement and a bystander. Medics said five people were wounded in the attack.
Also this morning, an Israeli warplane bombed a building next to the house of an Islamic Jihad leader in a strike the army said was intended to destroy a workshop used to make weapons.
Twelve people, including four women and four children, were hurt by shrapnel in the strike, none seriously. Islamic Jihad leader Abdallah al-Shami was not hurt, Islamic Jihad officials said.
The missile destroyed an uninhabited two-storey building adjacent to Mr Shami's house in a neighbourhood of Gaza City.
The army said the building was used as a workshop by the militant Hamas group to make Qassam rockets and other weaponry used against Israel in a three-year-old Palestinian uprising for statehood. Palestinian sources said the building was owned by a family with close connections to Hamas.
An army spokesman said the strike followed the firing of a salvo of Qassam rockets at the Israeli desert town of Sderot yesterday. Nobody was hurt in the rocket attack.
The strike followed the killing of three Israeli soldiers in an ambush in the West Bank last night that was claimed by the al-Aqsa Martyrs Brigades.
A senior Islamic Jihad official said the air strike "will only increase the Palestinian determination to continue Jihad and resistance".
He added: "The United States shares an equal responsibility . . . for its ongoing and unlimited support of Israel's policies."