Afghanistan suicide bomber infiltrates Kabul police HQ
Afghan authorities are investigating how a suicide bomber was able to enter the offices of the Kabul police chief and kill a senior officer.
Police chief Zahir Zahir was not in his office at the time of the attack, but he said his Chief of Staff Yassin Khan was killed and six others wounded.
The incident took place in one of the most fortified areas of the capital.
Kabul is regularly subjected to Taliban bombings, with the military, police and government officials all targeted.