At least 70 civilians have been killed and more than 500 injured across Ukraine since the start of May, UN human rights monitors said on Wednesday, as waves of attacks hit cities across the country and humanitarian workers struggled to reach communities near the frontline.

According to the UN Human Rights Monitoring Mission in Ukraine (HRMMU), 28 people were reportedly killed and 194 injured on Tuesday alone during Russian attacks.

“What is particularly alarming is both the scale of civilian casualties and the extent of territory affected in only a few days,” said Danielle Bell, head of HRMMU.