At least 12 people have been killed in an explosion in southwestern Pakistan outside the office of an independent election candidate, according to local officials.

Khanzai hospital, close to the site of the explosion, said 12 were killed and more than two dozen injured.

Pishin Deputy Commissioner Jumma Dad Khan said the blast had injured many people.

The explosion happened in the Balochistan region of the country.

No one immediately claimed responsibility for the attack.

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Pakistan has been gripped by a wave of violence ahead of general elections tomorrow.

On Monday at least 10 police personnel were killed and six others injured in a pre-dawn attack by militants on a police station in the northwestern Draban region.

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Last week a national assembly candidate was shot dead in Khyber-Pakhtunkhwa, and another political leader was shot dead on the same day in his party’s election office in Balochistan.

The day before a bomb attack following an election rally killed four people in Balochistan. Islamic State claimed responsibility.

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