A Syrian opposition group said at least 137 civilians, including 11 children, have been killed by government forces throughout the country on Thursday.
The Local Coordination Committees said 110 of the deaths were in Homs, Syria's third-largest city.
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Meanwhile, the Al-Arabiya network reported that seven members of President Bashar Assad's security forces were killed and dozens more were wounded when they were ambushed in the Daraa province.
Hadi al-Abdullah of the Syrian General Revolutionary Council, which is based in Homs, told Al-Arabiya, "There are 107 casualties here. Is this not a massacre? Today the missiles are being launched from a military college in the area, and they are falling like rain on the Baba Amr neighborhood. The city is also being bombarded from the air. Choppers are targeting all those who are trying to help the wounded. They want the wounded to die.
"All of Homs is destroyed," he said, adding that some victims are being buried in residential areas because the local cemetery is also being bombed. "The tragedy is that we can't help the wounded with anything."
An activist in Baba Amr told Al Jazeera that over 300 missiles have hit the neighborhood over the past five days, this in addition to attacks by tanks and choppers. "We can't reach the wounded because they are buried beneath the wreckage," he claimed.
The activist said some 200 people were in need of medical attention in the neighborhood, which he says is surrounded by forces loyal to Assad.
He said Assad's forces raided a neighborhood mosque and used locals as "human shields." The activist further claimed that residents were being arrested inside their homes.
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