REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE CONTENT OF THIS VIDEO, WHICH HAS BEEN OBTAINED FROM A SOCIAL MEDIA WEBSITE

These images uploaded to a social website, purport to show the aftermath of a government attack on rebel forces near the town of Hretan in northern Syria.

The town lies on the outskirts of Aleppo, where the two sides have been engaged in a vicious battle for control since 2011.

This latest attack was allegedly carried out by government forces dropping improvised explosives called barrel bombs from helicopters.

The Syrian Observatory for Human Rights says the attacks killed more than 35 people and left another 20 wounded.

The Syrian civil war, now into its fourth year, has killed close to 200,000 people and turned more than three million more into refugees.