A Metropolitan Police spokeswoman said attempts were made to stop and search three men in Charlton, south east London.
Two of the men were detained by officers, but one man in a vehicle failed to stop and short pursuit took place.
All three were arrested on suspicion of firearms offences.
The men remain in custody and enquiries are ongoing, the spokeswoman said.
Video footage shared on social media shows a white van being chased by both marked and unmarked vehicles in Floyd Road.
Pictures later show armed officers arresting a man in nearby Springfield Grove.