Four Syrian organisations have said Russia bears "a high likelihood" of responsibility for 304 attacks in Aleppo that violate international humanitarian law and may constitute war crimes.

Overnight talks have reinforced a ceasefire deal to allow Syrian rebels and tens of thousands of civilians to leave the war-torn eastern city of Aleppo, the media arm of Lebanon's militant Hezbollah group has said.

It is unclear whether peace talks aimed at resolving the Syrian conflict will go ahead today.

Syrian government helicopter gunships have attacked a suburb of the capital, Damascus, a day after air strikes on nearby areas killed at least 45 people, opposition activists said.

Almost a third of asylum seekers arriving in Germany who claim to be Syrian are not, according to officials.