KABUL, May 14 (Xinhua) -- Four inmates were killed and 33 people, including 20 police officers, were wounded in a prison riot in Kabul, Afghanistan on Tuesday, spokesman of Ministry of Interior Affairs confirmed.

"Attorney General Office and Ministry of Interior Affairs had ordered a search of Special Narcotics Blocks of Pul-e-Charkhi Prison. Four buildings were searched in morning. But later violence broke out at midday during the search of remaining buildings after a group of prisoners attacked police, injuring 10 police officers," spokesman Nasrat Rahimi told Xinhua.

The police personnel fired on the air as the inmates tried to grab police forces' weapons during the clashes, he said, adding as a result of violence four inmates were killed and 13 prisoners and another 10 police were wounded.

The riot was brought under control in the afternoon, Rahimi added.

He said that an investigation has been initiated into the incident and details will be shared with the media soon.