Officials say a wave of bombings in southern Afghanistan has killed 15 people, including six members of the country’s security services.

Omar Zwak, a spokesman for the governor of Helmand province, says there were four bombings. All of them took place late on Friday in different locations in Helmand.

Mr. Zwak says the deputy head of Sangin’s intelligence service was among those killed in the explosion.

Insurgents have increased attacks in Helmand as foreign forces withdraw from the area.