The Taleban have claimed that the assailant who opened fire inside the ministry compound on Monday was an army officer working as a sleeper agent for the insurgency.

But Defense Ministry spokesman Gen. Mohammad Zahir Azimi said on Wednesday the attacker was an outside infiltrator.

Azimi didn’t say how this was determined.

The Afghan government collects biometrics data on new recruits, but is just beginning to collect it for longer-serving soldiers.

Azimi also says an officer wounded in the attack has died in the hospital, raising the toll in the attack to three killed.