Syria ceasefire not dead: Kerry

US Secretary of State John Kerry insisted yesterday that hopes for a ceasefire in Syria remain alive after meeting with Russia and key powers with a stake in the civil war.

In brief remarks to reporters as he left a New York hotel after a meeting of the International Syria Support Group, Kerry said talks would reconvene later this week.

"The ceasefire is not dead," Kerry insisted, one day after the Syrian military declared a week-old truce over and launched new bombardments on rebel held cities.

The United Nations envoy Staffan de Mistura confirmed that there was still hope of reviving the ceasefire, but admitted that delegates agreed it was in danger.

People inspect a damaged house after an air strike on the rebel held Urm al-Kubra town, western Aleppo city, Syria yesterday. The United Nations suspended all humanitarian convoys in Syria yesterday following the deadly air strike on aid trucks, as fighting intensified after the regime declared an end to a week-long truce. Photo: Reuters

The 23-nation ISSG, chaired by Kerry and his Russian counterpart Foreign Minister Sergei Lavrov, met in New York on the sidelines of the UN General Assembly.

The talks were brief and, participants said, tense.

Damaged Red Cross and Red Crescent medical supplies lie inside a warehouse. The United Nations suspended all humanitarian convoys in Syria yesterday following the deadly air strike on aid trucks, as fighting intensified after the regime declared an end to a week-long truce. Photo: Reuters

"The mood is that nobody wants to give this thing up," Britain's Foreign Secretary Boris Johnson told reporters.

"Quite frankly the Kerry-Lavrov process is the only show in town and we've got to get that show back on the road."

Damaged aid trucks are pictured after an airstrike on the rebel held Urm al-Kubra town, western Aleppo city yesterday. Photo: Reuters