Detectives in Oldham are appealing for information about 'a disturbance' outside a petrol station in Lees.
Witnesses reported seeing a disagreement between two groups of men on Huddersfield Road at about 12.40pm on Wednesday afternoon (21 July).
Detective Inspector Damian Threader, of Oldham CID, said: "There appears to have been a disturbance outside the Tesco petrol station between the occupants of two vehicles and we are appealing for witnesses - anyone who may have seen anything or anyone with CCTV or dashcam footage."
Anyone with information should call police on 0161 856 8962 or 9080 quoting incident 1343 of 21/7/21.
Information can also be reported online or by using the Live Chat function at www.gmp.police.uk.
If you can't report online, call 101 or Crimestoppers anonymously on 0800 555 111.