By
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 Qadhafi, 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 Qadhafi.
An international coalition began carrying out strikes on forces loyal to Qadhafi on March 19, under a United Nations Security Council mandate to protect civilians in the country.
NATO took command of operations over Libya on March 31.