The accused has been arrested and suspended from service, they said.
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Kannur city police commissioner Ajith Kumar said various sections including attempt to murder were imposed against the accused and he was suspended from the service.
The arrest of the accused was recorded on Monday, police added.
The employee, Anil, was attacked when the police driver allegedly tried to leave without paying the amount for the fuel on Sunday evening, police said.
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In the video, Anil can be seen having an argument with the accused, identified as K Santhosh Kumar.
As the argument escalated, the driver suddenly accelerated the car, where the petrol pump employee was thrown onto the bonnet of the vehicle. The car with the staff on the bonnet travelled and stopped after covering nearly a kilometer along the busy road.
Anil, who suffered injuries to his hands, later lodged a complaint with the Town Police.