A Pakistani official says a bomb in the country's southwest hit a convoy of vehicles carrying a candidate in the country's upcoming parliamentary election, killing three people and wounding seven others.

Abdul Sattar Mengal says Sardar Sanaullah Zehri's convoy was passing over a bridge in Baluchistan province's Khuzdar district Tuesday when a bomb was detonated by remote control.

Zehri, the Baluchistan president of the Pakistan Muslim League-N party, was unharmed. But his brother, son and nephew were killed.

Another government official, Mohammad Akbar, said Zehri's vehicle passed over the bridge safely because it had jammers that prevented the bomb from detonating. But several vehicles traveling in the convoy were hit.

Baluchistan is home to both Islamic militants and nationalists who have been waging an insurgency against the government for decades.