It was reported to North Yorkshire Police at 5.16am yesterday by Yorkshire Ambulance Service.
Following enquiries, two men aged in their early-30s and one man aged in his mid-20s have been arrested in connection with the investigation. A 32-year-old man arrested has since been released without charge.
The injured man and woman are receiving treatment at hospital and said to be in a stable condition.
Officers are working to establish the full facts with house-to-house and forensic enquiries on-going in a number of locations in Selby.
A North Yorkshire Police spokesman said:”Witnesses or anyone with information that could assist officers are to come forward without delay.”
Contact 101, select option 2, and ask for York Serious Crime Team. To pass on information anonymously, call Crimestoppers on 0800 555111.
Quote reference number 12160174009 when providing details about this incident.