Two weeks after Russia launched its invasion of Ukraine, Kremlin-backed rebels assaulted a nursing home in the eastern region of Luhansk. Dozens of elderly and disabled patients, many of them bedridden, were trapped inside without water or electricity.

The March 11 assault set off a fire that spread throughout the facility, suffocating people who couldn’t move. A small number of patients and staff escaped and fled into a nearby forest, finally getting assistance after walking for 5 kilometers (3 miles).

In a war awash in atrocities, the attack on the nursing home near the village of Stara Krasnyanka stood out for its cruelty. And Ukrainian authorities placed the fault squarely on Russian forces, accusing them of killing more than 50 vulnerable civilians in a brutal and unprovoked attack.

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But a new United Nations report has found that Ukraine’s armed forces bear a large, and perhaps equal, share of the blame for what happened in Stara Krasnyanka, which is about 580 kilometers (360 miles) southeast of Kyiv. A few days before the attack, Ukrainian soldiers took up positions inside the nursing home, effectively making the building a target.

At least 22 of the 71 patients survived the assault, but the exact number of people killed remains unknown, according to the U.N.

Read more: AP