The Syrian government has bombarded the besieged Damascus suburb of Darayya hours after the arrival of its first food aid since 2012.
Darayya's city council said 28 barrel bombs were dropped from helicopters, preventing the aid from being delivered to residents.
Overnight, trucks carrying medicine, food and flour reached the town.
A member of the Darayya City Council said there had been "intense random barrel bombing" of the area over 3 hours until midday, hindering the distribution of the aid delivered overnight by the UN and Syrian Red Crescent convoy.
Rebel-held Darayya, which is surrounded by government forces, was among the first to report protests against President Bashar al-Assad's government.