Four loud blasts hit the eastern suburb of Tajuraa in the Libyan capital of Tripoli on Saturday, a Xinhua correspondent said.
The explosions sent a thick cloud of black smoke rising high into the air as NATO jets flew over the city. There were no reports about casualties and damage.
Earlier Saturday, Libyan state TV said 15 people were killed and 20 others wounded in a NATO air attack on civilian sites in the costal oil city of Brega.
The Libyan authorities accused NATO of targeting civilians after bombing a restaurant and bakery in Brega.
NATO rejected the report, saying it hit "military targets."