Six people were injured after an Audi was driven into a crowd in Cleckheaton, West Yorkshire in the early hours of Sunday.
One man sustained life threatening injuries and a further five men were rushed to hospital following the collision in Cleckheaton at around 12.37am.
Two people remain in hospital and three others since been discharged.
Police are now appealing for help tracing the driver of a red Audi which ploughed into the group on Bradford Road.
A 49-year-old man was later arrested on suspicion of attempted murder and remains in custody.
Earlier in the evening, there is believed to have been an altercation between the driver of the vehicle and some of the injured parties.
Detective Chief Superintendent Pat Twiggs, said: "This is clearly a very serious incident and one which has caused understandable concern in the community.
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"We have been conducting enquiries throughout the night and have spoken to a number of witnesses.
"I would appeal for anyone who has information and has yet to speak to officers to please get in touch.
"I would also appeal for anyone who has any dashcam footage of the incident to contact our officers.
"I would also ask for anyone who has CCTV in the local area which may have captured the incident or the red Audi driving in the area to contact officers as soon as possible.
"A scene remains in place while our enquiries continue."