Afghan officials say twin bombings near the Defense Ministry in the capital have killed at least five people.

Deputy Defense Ministry spokesman Mohammad Radmanish says the second bombing on Monday was caused by a suicide attacker who struck the area of the first blast after security forces gathered there.

Public Health Ministry spokesman Ismail Kawasi says five people were killed and another 15 were wounded in the attack, which took place as ministry employees were leaving their offices.

Taliban spokesman Zabihullah Mujahid said his group had carried out the attack. The insurgents have been fighting to overthrow the U.S.-backed government for 15 years, and frequently target Afghan security forces.