The ceasefire in Syria "is about to collapse," an official from the opposition said in an interview published Sunday, just days before the resumption of peace talks in Geneva, AFP reports.

"Over the last 10 days we have seen a very serious deterioration and the ceasefire is about to collapse," Bassma Kodmani, a member of the High Negotiations Committee of the Syrian opposition, told Journal du Dimanche, saying "the use of barrel bombs has resumed".

"The US-Russian mission monitoring the ceasefire is powerless," she told the French newspaper.