Four killed in Pakistan jail riot

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At least four inmates have been killed and a dozen injured during a riot in a prison in southern Pakistan.

Officials said guards at the Malir district prison in Karachi opened fire to prevent a group of prisoners attempting to break out through a gate.

Prisoners have complained of harsh treatment and overcrowding in the jail, which houses more than 2,500 inmates, twice its original capacity.

Karachi's central jail saw a similar riot over conditions on Monday.