The Associated Press reports: 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.