A bomb targeting security forces on Thursday killed three people and wounded 25 others in Pakistan's restive southwest, officials said.

The remote-controlled bomb was planted on a bicycle near a checkpost run by police and the paramilitary Frontier Corps in the Satellite town area of Quetta, the capital of Baluchistan province.

"At least three people including two policemen were killed and 25 others wounded in the blast," senior local police official Samiullah Soomro told AFP.

He said eight of the wounded, including six policemen and two FC officials, were in a critical condition.

Senior local administration official Zahid bin Maqsood also confirmed the incident and casualties.

There were no immediate claims of responsibility for the explosion.

Baluchistan has been badly hit by a decade-long Baluch separatist insurgency and sectarian violence mainly targeting Shiite Muslims from the Hazara ethnic community.