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27 others were injured as an autorickshaw carrying schoolchildren bore the brunt of the bomb.
The largest of the attacks targeted vehicles from buses to goods trucks on a major highway, killing at least 23 people.
According to the police, the blast took place in the Rukni Bazaar, a busy market in the Barkhan district of the province.
The bus carrying around 48 people crashed on the way from Balochistan's capital of Quetta to the southern city of Karachi, officials said.
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