A police escort was spotted travelling near Southampton Airport, shown in a video.
The motorcade travelled past Southampton Airport Parkway railway station at about 9.30am on Thursday, March 26.
James Horn, 25, was stood at the train station when the procession went past.
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He said: “I did not know who or what it was at first, I was just getting a train to come home.
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“Then I saw the police cars and motorbikes coming along the road.
“I could not see who it was because the windows were blacked out, but there was a massive police presence around the car.”
James, who works in the NHS, estimated that there were three motorbikes and two Transit vans in the group.
A video shows an officer on a motorbike stopping traffic as they escort goes past the train station, with a mixture of undercover and marked police vehicles.
Police said it was normal operational activity.