Satellite image provider Maxar Technologies released the photos, which it said showed more than 200 mass graves in a town where Ukrainian officials say the Russians have been burying Mariupol residents killed in the fighting.

The imagery showed long rows of graves stretching away from an existing cemetery in the town of Manhush, outside Mariupol, AP reported.

Mariupol Mayor Vadym Boychenko accused the Russians of “hiding their military crimes” by taking the bodies of civilians from the city and burying them in Manhush.

The Mariupol City Council said Thursday in a post on the Telegram messaging app that the graves could hold as many as 9,000 dead.