At least 71 people were killed in Israel’s attack on Tehran’s Evin prison, a notorious facility where many political prisoners and dissidents have been held, Iran’s judiciary said on Sunday.

Judiciary spokesperson Asghar Jahangir posted on the office’s official Mizan news agency website that those killed on Monday included staff, soldiers, prisoners and members of visiting families. It was not possible to independently verify the claim.

The June 23 attack, the day before the ceasefire between Israel and Iran took hold, hit several prison buildings and prompted concerns from rights groups about the safety of the inmates.