The UN Security Council met Wednesday (September 21st) for crisis talks on Syria as air raids shook Aleppo and diplomatic tensions ran high over an attack on an aid convoy, AFP reported.

UN Secretary-General Ban Ki-moon told the council that a ceasefire ended by the Syrian army must be revived as a first step to salvage a US-Russian deal on ending the five-year war.

"We are at a make or break moment," Ban told the council.

The UN chief urged world powers to use their influence to help re-start political talks between Syrians and allow them "to negotiate a way out of the hell in which they are trapped".

Ban told the council that he was "looking at options for vigorously investigating" the Monday attack on a joint UN, Red Cross and Red Crescent aid convoy "and similar atrocities against civilians" during Syria's war.

"We must remain determined that the ceasefire will be revived," Ban said.

"The Syrian tragedy shames us all. The collective failure of the international community should haunt every member of this council," he said.

Meanwhile, intense air raids shook Syria's Aleppo and killed a team of medics on Wednesday.