A bomb exploded here in the southwestern Pakistan city of Quetta on Thursday, killing at least 11 people.br br The blast, which also wounded scores of others, ripped through a busy part of the city.br br The target of the attack wasn't immediately clear, but the bomb went off near a paramilitary checkpoint.br br Shops, homes, and parked cars were also damaged in the explosion.br br Quetta is the capital of oil and gas-rich Baluchistan Province, which borders Iran and Afghanistan, and has been plagued by sectarian violence and attacks by Taliban militants.