The attack brought a three-story home crashing down on the al-Dalou family inside and killed two of their neighbors. It was the highest number of deaths in a single incident since an Israeli offensive began on Wednesday with the declared aim of ending years of sporadic cross-border rocket fire.
A day after Sunday's strike, whose victims spanned four generations from a 1-year-old to an 83-year-old, it was still not clear from Israeli comments why the building had been hit.
A military spokeswoman told Reuters the circumstances were still under investigation and she could not provide any details at this stage.
Four women from the al-Dalou family - Samah, Tahani, Suhaila and Ranim - and four children - Jamal, 6, Yousef, 4, Sarah, 7, and 1-year-old Ibrahim - were buried in Gaza City on Monday.
Rescue crews are still searching the rubble for the bodies of a teenage daughter and a son from the family.
The Israeli newspapers Haaretz and Maariv said the army had fired at the wrong house, while Israel's top-selling daily, Yedioth Ahronoth, reported the al-Dalou home was indeed the target and that it housed a Hamas militant.
Around the time of the attack, the military said it had hit the commander of Hamas's rocket-launching operations. They named him as Yihia Abayah.
Soon after, reports began coming in that a family was killed in the strike.
Several hours later, the Israeli army's chief spokesman, Yoav Mordechai, said on television the military tried to attack Abayah.
"Although I don't know the outcome, there were civilians harmed by this".Identity unknown
But around the al-Dalou's home, people say they know nothing of Yihia Abayah.
Hatem al-Dalou, a relative of the family, said: "I have never heard such a name (Yihia Abayah). This is nonsense."
Some Israeli media speculated the target of the attack was a different militant, a Hamas-affiliated engineer thought to be in the house.
Sources in Gaza reject that theory flat out. People who know the family said its father is a grocery-shop owner and that he was not at home when the dwelling was hit.
Brigadier-General Asaf Agmon, a retired senior commander in the Israeli air force, said that tragic mistakes can happen if intelligence is wrong or if aircraft misfire.
Israeli drones routinely overfly Gaza. The military is widely believed to use militants' cell phones to track them as well as tips from informers.
"The process of approving a target in this kind of operation is a long one," Agmon said. After intelligence provides data on a target, "we check that he really does have blood on his hands and that he intends to continue with such activity".
Information is verified with more than one source, he said.
"If the target is located in a place where there are innocent people - the operation is not approved," Agmon said.
Over 100 Palestinians have been killed in the Gaza offensive so far, including dozens of women and children. Three Israeli civilians were killed on Thursday by Palestinian rockets.
JERUSALEM (Reuters) -- The Israeli military on Monday said it could not yet provide an explanation about an airstrike on Gaza that killed 12 Palestinian civilians, including 10 members of a single family.