Forces loyal to Libyan dictator Muammar Gaddafi have killed more than 100 people in the al-Jabal al-Gharbi district, west of capital Tripoli, reports say.
Local residents say Gaddafi's troops have continuously pounded the area with Grad rockets during the past 24 hours, Press TV reported.
They also accuse the regime of committing a massacre in the cities of Yafran and Nalut.
Meanwhile, rebel forces say Gaddafi troops' latest attack on the city of Misratah has left four civilians dead. Five people have also been wounded in the attack.
Medics say some 1,000 people have been killed in beleaguered Misratah since the fighting began six weeks ago. Around 80 percent of those killed are said to be civilians.
Reports indicate a sudden rise in the number of people suffering gunshot wounds to their heads and necks.
Rights groups warn that the situation in Misratah is dire as the city remains under an almost two-month siege by Gaddafi loyalists.