A Police Ombudsman investigation into a police shooting in west Belfast is set to continue.
Police fired shots at the lorry
The shots were fired after the vehicle failed to stop and collided with a car and a police vehicle in the St James Park area off the Falls Road.
One man has been arrested. Local politicians have expressed concern and are calling for an explanation into why live shots were fired.
HM Revenue and Customs officers are investigating the lorry's contents.
An amount of fuel is being tested.
A representative of the Ombudsman, which investigates all police shootings, attended the scene of the incident on Friday.
Chris Mahaffey of the Ombudsman's office said he understood police had tried to stop the lorry on the M1 motorway.
"There followed a short pursuit.
"During that I believe that one of the officers got out of the police vehicle he was in and attempted to confront the driver, during which I'm aware a police officer discharged his firearm," he said.
"It will be a thorough investigation - we'll be looking to establish the justification and the reasons why the officer discharged his firearm at the vehicle and this could take some considerable period of time."
The SDLP's Alex Attwood said the police would have to give a "sufficient explanation" as to why shots were fired.
Sinn Fein have expressed concern at the shooting. West Belfast councillor Marie Moore said she had heard that the van was forced off the motorway into a residential area.