It is believed a man was critically injured after being hit by a police car in Alice Springs overnight.

The 28-year-old has been hospitalised as a result of the incident.

He is alleged to have been armed with a knife.

The latest injury comes while there are extra police in Alice Springs still investigating the shooting death of 19-year-old Kumanjayi Walker at Yuendumu, 300km northwest of Alice Springs, just over a week ago.

Tensions between Aboriginal communities and authorities remain heightened as a result.

Today police say they are investigating the incident in which a 23-year-old man was hospitalised with a head injury in Alice Springs overnight.

Around 8.20pm police responded to a report of an armed person at a business on Larapinta Drive, Araluen.

"Vehicles attended and in the process of attempting to apprehend the man there was a collision with the man and one of the vehicles," police said in a statement just released.

Police administered first aid until St Johns Ambulance arrived and transported the man to hospital.

This is being treated as a serious custody incident and the investigation will have oversight of the Professional Standards Command.

The circumstances surrounding the incident are being investigated, and no further information is available at this time.

Anyone who witnessed the incident or has information which may assist is urged to contact police on 131 444 or report it anonymously via Crime Stoppers on 1800 333 000.

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