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According to reports, the attack left 12 others injured.
Governor’s spokesman, Omar Zwak, told Pajhwok Afghan News that the incident took place in Du-Rahi area of the district around 8:30am this morning.
The bombing left several military and non-military vehicles and a large part of the building, reports said.
Taliban has claimed responsibility for the attack.
"A Taliban spokesman, Qari Yousuf Ahmadi claimed responsibility of the attack and said several policemen suffered casualties in the incident," Pajhwok Afghan News reported.