Police and paramedics attended the scene and the man was taken to The University Hospital of Wales in Cardiff for treatment with injuries thought to be serious. Gwent Police are investigating the assault and have closed the top part of Monnow Street from Agincourt Street down to Lloyds bank 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.