Russian forces have been accused of making these graves shortly after capturing the city. Russian forces reportedly built several mass graves in Mariupol and deposited hundreds of corpses of Ukrainian war victims there, according to Ukrainian media. Satellite imagery from near the besieged Ukrainian city shows a mass grave site that has expanded in recent weeks to contain more than 200 new graves, a private US company said on Thursday. Ukrainian officials identified the location of the mass graves two days earlier, CNN reported, as Russian forces have nearly captured Mariupol as of Thursday, and have backed Ukrainian forces and civilians to the Azovstal power plant. Maxar Technologies MAXR.N said a review of images from mid-March through mid-April indicates the expansion of the graves began between March 23-26. The site lies adjacent to an existing cemetery in the village of Manhush, 20 kilometers west of Mariupol, Maxar said
via jpost: Satellite images reveal mass graves dug outside of Mariupol, Ukraine