Amnesty International said on Wednesday that Russian air raids have killed hundreds of civilians in Syria, many in targeted strikes that could constitute war crimes, since beginning nearly three months ago.

Some attacks "appear to have directly attacked civilians or civilian objects by striking residential areas with no evident military target and even medical facilities, resulting in deaths and injuries to civilians", Amnesty Middle East and North Africa director Philip Luther said in a statement, according to AFP.

"Such attacks may amount to war crimes," he said, adding that it "is crucial that suspected violations are independently and impartially investigated".