The blast occurred in Nawagai tehsil of Chaharmang area and targeted labourers, the political administration officials said.
Political authorities told that a vehicle carrying labourers was hit by a roadside IED, killing three labourers and injuring 26 others.
The injured were rushed to the Agency Headquarters Hospital where condition of some of the injured labourers were stated to be critical.
The security forces rushed to the site and have started search operation. No group or individual has yet claimed responsibility for the attack.
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