Libyan leader Muammar Gaddafi endured a NATO air strike but with his youngest son and three grandchildren killed on a Tripoli house on Sunday, according to a government spokesman.

Journalists depicted in their reports a Tripoli house which had been smacked by at least three missiles. The smashed roof left steel rods and concrete chunks mixed up inside the house.

Saif Al-Arab Gaddafi's, 29, had been killed in the attack. He is the youngest and one of Gaddafi's less important sons, with a limited role in the power structure.

Mussa Ibrahim, government spokesman, said in a news conference, "What we have now is the law of the jungle. We think now it is clear to everyone that what is happening in Libya has nothing to do with the protection of civilians."

British and French-led NATO forces are authorized under a United Nations resolution to launch air attacks on Gaddafi forces. This is to give protection to civilians from the harmful uprising between Gaddafi and a number of Benghazi rebels who have captured much of the eastern part of the country.

NATO did not give any immediate reaction right after the attack. There were no independent confirmations too of the possible deaths.

It appeared to be the second NATO strike near to Gaddafi in 24 hours after a missile hit near the television station early on Saturday. The missile attack was believed to interfere with the Libyan leader’s public address where he announced that he would never step down nor offer peace talks to the rebels.

“White House was aware of Libyan media reports on the death of Gaddafi's son and was monitoring the situation until now,” said U.S. White House press secretary Jay Carney.

Neither of the fighting sides in Libya's civil war has achieved a decisive blow and remains in a deadlock for the recent weeks.