Gunmen have killed at least 10 Afghans working for an international mine-removal organization.
Violence has been surging in Afghanistan since the US began withdrawing the last of its troops.
The attack occurred late Tuesday at a camp run by the HALO Trust.
More than 100 people engaged in mine removal were at the camp at the time. At least 10 were killed and 16 wounded.
The organization issued a statement strongly condemning the attack on staff who were carrying out humanitarian work to save lives.
Afghan officials blamed the Taliban, who denied involvement. Some local media are reporting that the Islamic State group has claimed responsibility for the attack.
US troops plan to complete their withdrawal process by September 11.
The departure of international troops comes amid a deadlock in peace talks between the Afghan government and the Taliban.