The US, UK and France are taking the lead in enforcing a UN-mandated no-fly zone as Libyan leader Muammar Gaddafi fights an uprising against his rule.
He is said to be arming volunteers to join his forces.
A military radar site in Tajoura was on fire, a resident said. The district is known to house several military bases.
“The district was shaken by three explosions in succession,” the resident was quoted as saying.
The blasts followed coalition strikes on Col Gaddafi’s tanks and artillery around the eastern town of Ajdabiya.
Rebels and pro-Gaddafi forces are in a stand-off near the town, witnesses say.
Despite the reports of considerable setbacks for pro-Gaddafi forces, fighting has also continued in Misrata in the west where residents reported shelling continued late on Friday.