The killing of General Mohammad Daud Daud, the police commander for northern Afghanistan, on Saturday by a suicide bomber who infiltrated security wearingapoliceuniform, highlights a recent change in Taliban tactics, says the BBC's Bilal Sarwary in Kabul.
Sometimes she is dressed in her policeuniform, but often she is undercover, wearinga colourful salwar kameez (long tunic and pyjama) or a sari to blend in with the female passengers.