Armed police spotted in a Luton street on Monday evening were carrying out an “intelligence-led stop and search” operation.
Officers were at High Town Road at approximately 6.30pm.
One witness said: “I have never seen so many armed police, there were at least four.
“I am not sure what they were doing because I was in a taxi passing through.”
A spokesperson for Bedfordshire Police said: “We were carrying out an intelligence led stop and search.
“Unfortunately no further information is available at this time.”