A military site in Tripoli's eastern Tajura suburb was in flames early on Saturday after three major explosions rocked the district, a witness said.
"The district was shaken by three explosions in succession," the resident said, adding that the blasts had shattered windows.
"The raid targeted a military radar site which is still on fire," the resident, who lives close by, added.
Several military sites in the neighbourhood have already been targeted on a daily basis since the start of the coalition raids on Libya.
Earlier, state television reported that coalition warplanes had carried out raids late Friday on the town of Zliten, 160 kilometres (100 miles) east of Tripoli.
"Civilian and military sites were targeted this evening in the bombing of the colonialist crusader aggressor," said a caption in the report, without detailing what had been hit.
The coastal town of Zliten lies about 50 kilometres (31 miles) west of the opposition-held city of Misrata.
The Al-Watiya region, southwest of Tripoli, has a military base and has already been targeted by long-range missiles from the coalition, Al-Jamahiriya television added.