Israeli helicopters have fired missiles in the Gaza Strip, killing at least three people, one of them a militant.
Palestinians gathered calling for revenge
At least seven others were injured in the attack on a car travelling from Gaza City to the Jabaliya refugee camp on Saturday evening.
One of the dead was named as Amin Dahduh and described as a member of the Islamic Jihad militant group.
The Israeli army said the strike was carried out against senior Islamic Jihad members planning terror attacks.
Israel has frequently used helicopter gunships to target and kill Palestinian militants.
The last such strike was on 7 February when an attack helicopter was used to kill an aide to a senior Islamic Jihad militant.
A 14-year-old boy was also killed in Saturday's attack and at least nine other people were wounded.
The latest incident follows Friday's killing near the West Bank of an Israeli couple by Palestinian militants.
On Thursday, two Palestinian gunmen shot and killed an Israeli soldier at the Erez border crossing between Israel and Gaza.
The gunmen were killed in that incident.
Saturday's attack happened at about 1945 (1745 GMT), in a densely populated residential area.
Television pictures showed a car that had been completely destroyed.
One of the victims was so badly disfigured that they could not be immediately identified - but reports suggested it was either a brother or a cousin of the dead militant. There are conflicting reports about whether he was also an Islamic Jihad member.
Nevertheless, it is understood those killed were not senior Islamic Jihad officials, says the BBC's Matt Prodger in Jerusalem.
The third victim, whose identity was not immediately clear, was a bystander, Palestinian sources said.
Three children, including a girl in critical condition, were among the wounded, said doctors at Gaza's Shifa Hospital.
Palestinian security officials were seen struggling to keep order around the scene of the incident as crowds of people converged, calling for revenge.