24 May 2013 Last updated at 09:03 ET
There has been a large explosion in the centre of the Afghan capital, Kabul, followed by heavy gunfire.
Afghan Channel One TV quoted police as saying a group of assailants had entered the Directorate of the Afghan Public Protection Force.
It said some of the attackers had taken up positions in the building.
“We are dealing with a well co-ordinated attack,” said Kabul police chief Gen Ayub Salangi. “Afghan forces will deal with them.”
Local reports said ambulances were transporting casualties out of the area.
The Taliban said they were responsible for the attack, according to a report by AFP news agency.
Reports say smoke was seen over the centre of the city and the blast was felt several kilometres away.
Shopkeepers in the area said the explosion had shattered their windows. Part of Kabul was cordoned off.
AFP also quoted witnesses as saying there were two blasts, the second much more powerful than the first.