A bomb attached to a vehicle killed two members of Afghanistan’s independent human rights commission in Kabul on Saturday, the group said, as violence in the country rises despite a U.S.-brokered peace process.

Axar.az reports citing foreign media that the Afghanistan Independent Human Rights Commission (AIHRC) said in a statement that 24-year-old donor coordinator Fatima Khalil and 41-year-old driver Ahmad Jawed Folad were killed by an explosive device while in an AIHRC vehicle on the way to its office on Saturday.

“It is intolerable, assassinating human rights defenders is a war crime in the context of armed conflict,” the AIHRC said, adding that staff had previously been the target of attacks.

Kabul’s police spokesman confirmed that two people died in a blast early on Saturday.

No group claimed responsibility for the attack. A Taliban spokesman denied the group was involved.

It comes at a sensitive time amidst heightened violence around Afghanistan, including growing attacks against officials in urban centres.