Gunmen in northern Afghanistan killed 10 people and injured 16 others who were part of a charity operation working to deactivate explosives in nearby minefields, according to the group.

The Halo Trust announced on Wednesday that “an unknown armed group” attacked the workers at around 9:50 p.m. local time at a camp in the Baghlan province north of Kabul, where about 110 workers from local communities were involved in the demining effort.