A man has been arrested on suspicion of endangering an aircraft after the pilot of a police helicopter was temporarily blinded while at the controls.
The helicopter was helping chase a vehicle in the Lancashire area.
While the pilot was flying over Nelson the beam from a laser pen was shone into his eyes. He could not see and was forced to take evasive action.
The pilot directed ground patrols to the area, where a 45-year-old man was arrested for endangering an aircraft.
Lancashire Police said the incident on Wednesday night could have resulted in a crash and multiple injuries or deaths.
The man, from Nelson, is currently in custody and will be questioned by police later.