A Russian airstrike on a prison in southeastern Ukraine killed at least 17 inmates and wounded more than 80 others, officials said.

Four powerful Russian glide bombs hit a prison in Ukraine’s southeastern Zaporizhzhia region, authorities said. They killed at least 16 inmates and wounded more than 90 others, Ukraine’s Justice Ministry said.

The overnight attacks came after President Donald Trump expressed frustration with Russian President Vladimir Putin and brought closer the deadline for a ceasefire.