At least four people are killed and 10 others injured when a car bomb exploded in Pakistan's southwestern city of Quetta Sunday.

The car was parked in front of a house and later exploded.

No-one is claiming responsibility for the blast.

Quetta is the capital of Baluchistan province. Baluch militants have been waging a low-level insurgency for decades for more autonomy.

Islamist militants linked to al Qaeda and the Taliban are also active in the strategic region that borders Afghanistan and Iran.

Deborah Lutterbeck, Reuters