The Israeli air strike Sunday night, which followed a government decision to step up operations against Islamic militants, hit the house of lawmaker Khalil al-Haya, who was not at home and was unharmed.
At least 13 people were wounded. All the dead and wounded were relatives and neighbors, his wife said. Hamas said two of the dead were militants.
An Israeli aircraft attacked a car in the northern Gaza Strip on Monday, killing five Palestinian militants, Palestinian security and medical officials said.
Islamic Jihad, a militant group that has fired numerous rockets into Israel, said four of its members were killed in the attack.
The army confirmed the air strike in the Jebaliya refugee camp, and that Islamic Jihad was the target.
Israeli Prime Minister Ehud Olmert said the air strikes would continue until the rocket fire stops, reports CBS News correspondent Robert Berger. Israeli cabinet minister Gideon Ezra said Hamas political leaders have been ordering attacks, so they're legitimate targets.
Army spokeswoman Capt. Noa Meir said Sunday's air strike was not aimed at al-Haya, but at a group of five armed Hamas men, including a senior militant, near the home.
"They, and only they, were the target, and they were hit," Meir said. Any civilian casualties, she said, "were the result of the terrorists' use of civilians as human shields."
Israel resumed its air strikes in Gaza last week in response to increased Palestinian rocket fire at southern Israeli towns. The air strikes have killed 36 Palestinians, most of them Hamas militants.
Early Monday, Israeli aircraft struck four more times in Gaza, the army said, killing a Hamas militant. The military said two of the targets were weapons factories. Palestinians said one was a cement factory and the other was a house.