Police attended along with paramedics and the man, who was found unconcious, was taken to The Grange University Hospital with injuries thought to be serious. Gwent Police are investigating the assault and have closed the top part of Monnow Street whilst enquiries are ongoing.
Anyone with details, including CCTV or dashcam footage, can call 101 or DM them, quoting log 2200213333. You can also contact @Wales_CS anonymously on 0800 555 111.