A Pakistani volunteer and a police officer rush an injured person to a hospital in Quetta, Pakistan, Oct 24, 2016. [Photo/IC]

Local reports said that at least two terrorists wearing suicide explosives laden jackets have held the policemen hostage in the dinning hall of the hostel.

An injured policeman, who was rescued by the army commandos, said that the terrorists are wearing suicide jackets, while one of them have blown himself up.

An eyewitness police trainee said, we were sleeping in our room when we heard firing, we rushed out, I saw two terrorists were firing at another room, I ran to the roof of the hostel and from there I managed to come out.

According to police sources, at least 700 police personnel including trainees and instructors were present in the center when the attack took place.

Authorities have declared a state of emergency in all hospitals in Quetta and appealed to public for blood donations.

No group has claimed responsibility for the attack yet.

Pakistani Prime Minister Nawaz Sharif condemned the attack and said the terrorist cannot demoralize the nation with such coward attack and that the countrys ongoing war on terror will be taken to a logical end.

Xinhua contributed to the story.