A man and woman from Neath and a man from Pontardawe are among the group.
4 people have been arrested on suspicion of attempted murder after a man was found with serious injuries in Newport.
The 22 year old was found with serious head injuries in the Shaftsbury area of the city on Thursday.
A 46 year old man and a 37 year old woman - both from Neath - a 41 year old man from Pontardawe and a 22 year old man from Newport are being questioned by officers.
The victim remains in hospital in a critical condition.
Police are appealing for anyone with information to get in touch or dashcam footage from the Tewkesbury Walk, Evans Street, Shaftesbury Street and Glastonbury Close areas of Newport, between 6.30pm on Thursday 14th November 2019 and 12.30am on Friday 15th November 2019, please call 101 quoting 1900421597 or send a direct message to Gwent Police Facebook and Twitter social media pages.
You can also submit information including any footage via this link: https://crowd.in/f9WoVO