The case was registered on the basis of a complaint from an employee of the department, who was dismissed from service over some issue, officials said here.
He approached the department's special secretary appealing against his dismissal.
"It was also alleged that the Special Secretary, Transport Department, Government of Punjab, had cancelled the dismissal order and had further directed conducting of re- inquiry," CBI, Spokesperson, Abhishek Dayal said here.
Both had threatened the complainant that if he refused to pay the bribe, they would ensure issuance of adverse orders against him, the spokesperson said, adding that after negotiation, the bribe was reduced to Rs 1 lakh.
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The aggrieved had approached the CBI with the complaint against both of them.
"The CBI laid a trap in which both the officials were caught red-handed while demanding and accepting bribe of Rs 50,000 each. Searches are being conducted at the residences of both the accused in Chandigarh and Mohali (Punjab)," Dayal said.