The time to go has long since passed.

(BBC) — A woman wearing an Afghan police uniform has killed a US civilian aide at police headquarters in Kabul.

It is believed to be the first such insider attack carried out by a woman. She is now in custody.

In a separate incident, at least five local policemen were killed by another officer in northern Afghanistan.

There has been a rise in incidents in which Afghan security forces members have shot dead either foreign personnel or their own colleagues.

In Monday’s attack in Kabul, Afghan officials say, a female officer at the interior ministry came looking for the police chief at the heavily secured headquarters.

The US adviser was thought to have been on his way to a canteen when the woman, named as Nargis, shot him with her pistol.

The attacker has been detained. Officials say they suspect she has links with the Taliban.