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BEIRUT -- At least 29 people were killed in violence across Syria on Saturday, mostly civilians, and hundreds more were trapped in Douma as regime forces stormed the town in Damascus province, monitors said.
The Syrian Observatory for Human Rights urged the International Committee of the Red Cross and the Syrian Arab Red Crescent to "urgently send medical teams" to Douma.
"The security forces have seized control of the main hospital in Douma," the Observatory said. "There are no doctors in the town, though dozens of wounded need urgent care."
The Britain-based monitoring group warned of a "catastrophic humanitarian situation" in Douma, which "has been subjected to a fierce military campaign since June 21."
Violence has killed "scores and wounded hundreds" there since regime forces escalated attacks on the outlying suburb of Damascus, the group said.
"More than 100 families remain in the town, unable to flee and forced to take refuge in shelters," it said, adding that most of those trapped were women and children, after the majority of the men had fled repeated arrest sweeps.
The Observatory said those killed on Saturday included a civilian shot dead by a sniper in Douma, a rebel in Daraa, southern Syria, a family of three killed by shelling in the northwestern province of Idlib and four soldiers.
Restive Douma has seen frequent fighting between rebels and regime troops in recent months.
The watchdog also reported fierce clashes in the capital itself and the suburbs of Damascus, with regime troops using helicopters to shell several neighbourhoods on Saturday.
Elsewhere, regime forces shelled Rastan in the central province of Homs, the watchdog said, adding that the town has been under rebel control since February.
Meanwhile an explosion rocked the Qaboon district of Damascus on Saturday, the Observatory said, while a blast hit the country's second city Aleppo in the north. No casualties were reported.
Another blast hit an oil pipeline in a rebel-held area of the eastern province of Deir Ezzor.
The latest violence came amid fierce countrywide clashes, and a day after 75 people were killed nationwide.
More than 15,800 people have been killed in violence since an anti-regime uprising broke out in March 2011, according to the Observatory.