Iranian border guards have reportedly killed dozens of Afghans in a massacre as they attempted to enter the country.

The Islamic Republic’s border forces ambushed and opened fire on a group of about 300 migrants trying to reach Iran on Sunday night, multiple sources have reported.

“Dozens of Afghan nationals at the Saravan border were targeted,” said the Haalvsh human rights news agency, which monitors rights violations in Iran’s Sistan and Baluchistan region.

Border guards directly fired bullets and rockets at migrants, according to Haalvsh.