Syrian rebels accuse government of massacre in Damascus suburb BEIRUT - Syrian activists and rebel fighters said Monday that at least 100 people, many of them civilians, have been killed in a five-day Syrian government offensive on a predominantly Sunni area of the Damascus countryside. The death toll could be the largest from a single military campaign in nearly a year. Activists described a bloody war zone inside Jdeidet al-Fadel, an area west of the Syrian capital that remained critically isolated on Monday, a day after regime forces had reportedly withdrawn to the town's outskirts, trapping the surviving residents inside and keeping medical workers and activists out. The regime does not allow anyone to get in or out of the area. There is no way to save the injured people," said Mosab Abu Qatada, a spokesman for the Damascus Military Council, which is part of the rebel Free Syrian Army. The Syrian Observatory for Human Rights, a Britain-based watchdog group, said Monday afternoon that activists had documented 101 dead inside Jdeidet al-Fadel, including at least 10 women and three children. But the Observatory said in a statement that the actual number killed could exceed 250 "due to the fact that there are missing people that are hard to reach while the regime forces are deployed to the town." Activists said that a number of the area's residents had also been arrested over the weekend as rebel fighters ran out of ammunition and retreated from the area, allowing forces loyal to the regime of President Bashar al-Assad to accelerate their offensive. Some estimated the numbers of disappeared in the hundreds, and detailed the looting of area shops and burned homes. "Those arrests were taking place in a street where the FSA was not present and they could not stop it," said Aya Mahaini, an activist who spoke by Skype, using an alias, from the neighboring suburb of Madhamiyat al-Sham - which has also seen repeated shelling in recent days. The sounds of nearby explosions repeatedly interrupted the call. It was impossible to verify specific events or the number of missing or casualties beyond activist accounts. The United Nations says at least 70,000 people have been killed, and nearly a quarter of Syria's population has been displaced, in more than two years of brutal civil war. The Syrian Arab News Agency, a mouthpiece for the Assad government, said Monday that government forces had "inflicted heavy losses upon terrorists in the town of Jdeidet al-Fadl in Damascus Countryside, injuring a number of them [and] killing others." Assad's government refers to those fighting to end his rule as "terrorists." A pro-regime Facebook page called "Syria 24" reported Monday that government forces in Jdeidet al-Fadel had killed "600 terrorists" from Jabhat al-Nusra, a rebel jihadist group that the U.S. government has labeled a terrorist organization. Videos posted online Sunday and Monday purported to show rows of bodies from inside the beleaguered town. Some appear to have been shot in the face. In one video, a camera moves slowly over what looks like 10 bodies covered by blankets and body bags, as another person reveals their faces. At least two appear to be children.