Gwent Police is appealing for information after a man was found "seriously assaulted" at an address in the Shaftesbury area of Newport.
The ambulance service reported that a man was unresponsive within a property on Tewkesbury Walk at around 11.55pm on Thursday.
The 22-year-old, from the Newport area, was found with serious head injuries and was taken to the Royal Gwent Hospital where he remains in a critical condition.
Officers are urging anyone that might have noticed anything suspicious in or around Tewkesbury Walk, Evans Street, Shaftesbury Street and Glastonbury Close between 6.30pm on Thursday and 12.30am on Friday to come forward.
I would like to reassure residents in the Shaftesbury area that we are making every effort to establish the circumstances that took place that night and officers are currently in the area carrying out further enquiries. If residents have any questions or concerns, please do speak to them.