According to details, the bus had left Karachi for Pasni on Wednesday morning. As it reached Pasni, armed men flagged down the bus and collared out 20 persons and took them away.
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Security sources told that all the abductees were labourers and going to Pasni for work.
Soon after the incident a heavy contingent of security forces reached the town and began search operation.
They said the area had been cordoned off to catch the gunmen.
According to ARY correspondent, the Balochistan Home Ministry has not confirmed the incident as yet.