Two of the injured are in a critical condition, he said.
A senior police official said that the explosion took place at the final match of the tournament.
The police were investigating the nature of the blast and a possible motive.
Separatists and militants have been carrying out a number of terror attacks in Balochistan and usually attack security forces, including police, workers and labourers from outside the province who work on the multi-billion China-Pakistan Economic Corridor in different parts of the province.
Last year, seven soldiers of the Frontier Corps (FC) and seven security guards were killed when terrorists attacked a convoy escorting workers of the Oil and Gas Development Company Limited on the Makran Coastal Highway in Ormara.
In another attack last year, at least eight people, including police and FC personnel, were injured in a blast in Hub.
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