Three explosions were heard Sunday night as jets overflew Tripoli on Sunday night, witnesses said, after Libya accused NATO of trying to kill the country's embattled leader Moamer Kadhafi.

The explosions were in the eastern part of the city, the witnesses said.

Early on Sunday, government spokesman Mussa Ibrahim said that Seif al-Arab Kadhafi, one of the Libyan leader's sons, and three of his young grandchildren were killed in a NATO airstrike Saturday night, in what he termed an attempt to assassinate Moamer Kadhafi.

An international coalition began carrying out strikes on forces loyal to Kadhafi on March 19, under a United Nations Security Council mandate to protect civilians in the country. (AFP)