Kapurthala SSP Sandeep Sharma said the four policemen were on a vehicle ahead of the police pilot, and the driver of their vehicle was driving rashly, ignoring the instructions of DSP (Detective) Sohan Lal, who was commanding Singh's convoy.
The SSP said over phone that this created confusion and the chief minister's convoy could not find way for a while to come out of the cantonment situated on the KapurthalaHamira road.
Singh on Wednesday evening visited the Army cantonment to participate in the platinum jubilee celebrations of the Sikh Regiment.
He had made a brief stopover at the residence of Punjab Irrigation and Power Minister Rana Gurjit Singh here before attending the event.