The Police Investigations and Review Commissioner (PIRC) is investigating the circumstances of a road crash in Lanarkshire in the early hours of Thursday 22 November 2018.
A spokesperson for PIRC's investigations team said:
"We are investigating the circumstances surrounding a road crash on the A73 in Newmains on Thursday 22 November 2018.
"A 33 year old man suffered serious injuries as a result of the incident. Our investigation will focus on the police involvement leading up to the crash.
"The matter was referred to us by Police Scotland and a report will be submitted to them in due course."