Taliban forces killed a significant opposition leader after shooting him and his driver while their car was stopped at a checkpoint.

Rohullah Azizi, a brother of former Afghan vice president Amrullah Saleh, had led resistance forces in Panjshir Province. The last anti-Taliban stronghold in the country fell to the Islamists earlier this week.

“As we hear at the moment Taliban shot him and his driver at the checkpoint.” Azizi’s nephew, Shuresh Saleh, told the Associated Press.

Video circulating online reportedly shows a Taliban fighters firing on anti-Taliban resistance members recently captured in the province.