The bus was enroute to Karachi from North Waziristan when it was stopped in Dera Ghazi Khan.
The bus was stopped after CIA police was tipped about terrorist travelling on the bus.
Police found a passenger in possession of three hand grenades. The passenger was later identified as Imran.
During initial inquiry, Imran revealed that he had planned a large-scale terrorist activity in Rajanpur.
Imran has now been shifted to an undisclosed location for further interrogation.
Meanwhile security is beefed up at all entry points from Khyber Pakhtunkhwa and Balochistan into Punjab.
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