A roadside bomb struck a police van in eastern Afghanistan on Saturday, killing five police as they were on their way to a training session, authorities said.

Seven other police were wounded in the early morning blast in Paktika province, a statement from the provincial governor’s office said.

The van was taking the officers to a training centre in Janikahil district for exercises between the Afghan National Police and the village-level Afghan Local Police, separate branches of the security forces that international troops have been training. Among the five dead were two national police and three local police.

Bombings, assassinations and gun battles have soared in recent months. The Taliban and other militants have stepped up attacks as Afghan police and soldiers take over full responsibility for security and international forces draw down. The intense militant campaign has pushed violence to levels matching some of the worst of the 12 year-old war.