Footage of the incident, which had occurred in Pannipitiya, had quickly gone viral online, sparking public ire.
It has been revealed that the policeman is attached to the Maharagama police station.
Latest reports also reveal that minister of Public security - Sarath Weerasekara had ordered to suspend the policeman involved.
It is said that the lorry driver was assaulted after he had knocked a senior police officer in traffic duty this morning.
The lorry driver is currently being treated at the Kalubowila Hospital.
This is the second recent incident where a policeman had assaulted a civilian.
A few weeks back, a Chief Inspector of Police and three Police Constables attached to the Peliyagoda Police Station were interdicted over assaulting the youth within the Police Station.
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