The SDLP has called for the suspension of the police officers involved in yesterday's fatal shooting in Ballynahinch in Co Down.
A Police Ombudsman's inquiry has begun and questions are being asked as to why officers opened fire.
The three men and two women arrested at the scene of the shooting have been released on police bail.
The Ombudsman's office says the checkpoint was set up after reports that a stolen BMW was heading towards Ballynahinch from Ballykinlar, 12 miles away.
The driver was shot dead but his body lay outside the car, suggesting he was not speeding through the checkpoint when he was killed.
A team of 15 investigators from the Police Ombudsman's office has visited the scene.
SDLP MP Eddie McGrady has also called for an inquiry into the police use of firearms.