BEIRUT -- Syrian warplanes bombed a building in a Damascus suburb on Saturday, killing at least eight people in the first airstrike since an internationally mediated cease-fire went into effect, activists said.
The attack came a day after car bombs and clashes left 151 dead, according to activist tallies, leaving the four-day truce that began Friday at the start of a major Muslim holiday in tatters.
The rapid unraveling of the effort to achieve even a temporary peace marked the latest setback to ending Syria's civil war through diplomacy after months of failed efforts.
The Britain-based Syrian Observatory for Human Rights said eight people were killed and many others wounded in the airstrike in Arbeen, a suburb of the capital. The area also has witnessed heavy clashes and intense shelling.
An amateur video posted by activists online showed a building that was turned into a pile of rubble said to be from the airstrike. A lifeless hand stuck out from the debris. The videos appeared consistent with AP's reporting in the area.
In the north, rebels and Kurdish neighborhood guards fought a rare battle late Friday in the embattled city of Aleppo that left 30 people dead, activists said.
In all, 151 people were reported killed on Friday, including 11 in a car bomb in a residential area of Damascus, on par with the daily death tolls preceding the cease-fire.
Shelling and clashes resumed Saturday nationwide.
A car bomb parked behind an Assyrian church near a military police compound and a military court went off Saturday killing five people In the eastern city of Deir el-Zour, according to the Observatory. Military forces that rushed to the site of the blast then came under rebel fire, and three soldiers were killed, it said.
State-run TV denied the blast caused any casualties.
Nobody claimed responsibility, but the attack was similar to those staged in the past by a radical Islamic group fighting on the rebel side, Jabhat al-Nusra, which has rejected the cease-fire outright.
The Observatory also said 30 rebels and Kurdish gunmen were killed in clashes that broke out in Aleppo's predominantly Kurdish neighborhood of Ashrafieh late Friday. A Kurdish official put the death toll at 10 Kurds, but had no figures for the rebels.
Rebels made a push Thursday into largely Kurdish and Christian areas that had been relatively quiet during the three-month battle for Syria's largest city.