AS Russia pulls its forces back from areas around Ukraine's capital Kyiv, the BBC has seen evidence of potential war crimes on the outskirts of the city.

BBC correspondent Jeremy Bowen counted 13 bodies on one small stretch of highway where, just hours earlier, Russian forces had been in control.

We know who two of the dead were: a Ukrainian father and mother who had been fleeing to the capital with their daughter and an elderly woman. We know this because their deaths - as he put his hands up in surrender, trying desperately to stop Russian forces firing on the car they were travelling in - were caught on camera by a drone.

In other places along the road, attempts had been made to cover up the bodies.

Our correspondent says we don't know what happened to these people, but a credible working assumption for any investigation must be that the other dead people were killed by either the tank crew seen in the drone video, or other Russian soldiers. The drone footage has been handed to the authorities for investigation.

There have been numerous allegations of war crimes made since the start of the invasion in February, and both the UN and the International Criminal Court are looking into them.

Russia accused Ukraine of being responsible for a huge fire at an oil depot in the Russian city of Belgorod.

Russian officials said two Ukrainian military helicopters had crossed the border from Ukraine and fired missiles at the facility.

Vyacheslav Gladkov, governor of the Russian city of Belgorod, some 40km (25 miles) from the border, said the early morning rocket attack left eight fuel tanks ablaze.

Initial statements from Ukraine would neither confirm nor deny that - but later in the day, the secretary of Ukraine's security council, Oleksiy Danilov, said the Russian version of events "does not correspond to reality".

But if it is true that Ukraine mounted the attack, our defence correspondent Jonathan Beale notes, it would mark the first time that Ukrainian aircraft have flown into Russian airspace to hit a target, bringing the war home to Russia.