ISLAMABAD, May 17 (Xinhua) -- A group of terrorists attacked a center of security forces on the outskirts of Quetta, provincial capital of Pakistan's southwest Balochistan on Thursday evening, local media reported.

According to the reports, four blasts followed by an intense exchange of fire were heard after the terrorists attacked a rescue center of the Frontier Corps, a paramilitary force, located near Chaman Housing Scheme on the outskirts of Quetta.

Additional contingents of security forces have reached the site as the fire exchange is in process.

No official words have come about the attack yet.