An attack on a Pakistani police training academy on Monday has left 59 dead and more than 100 injured.

Local officials said five to six gunmen fired at the training center in the southwestern city of Quetta. Later they raided a dormitory where some 200 trainees were resting and sleeping. Some were also taken hostage.

An operation to clear the facility lasted five hours.

No militant group has claimed responsibility for the assault.

Injured personnel receive medical treatment at a hospital in southwest Pakistan's Quetta, on Oct. 24, 2016. At least 20 people including policemen and security personnel were injured and over 200 others held hostage by unknown militants in an attack in Quetta, southwest Pakistan on Monday night. (Xinhua/Asad)

People transfer an injured police trainee to a hospital in southwest Pakistan's Quetta, on Oct. 24, 2016. At least four police trainees were injured and over 200 others held hostage by unknown militants who attacked a police training center in Pakistan's southwest provincial capital of Quetta on Monday night, Pakistani military and government officials said. (Xinhua/Asad)