Rhys Davies was a Cardiff City and Manchester United supporter
Two Cardiff teenagers arrested in connection with the murder of a 17-year-old student have been released on bail, police have said.
Rhys Davies, from Tredegar, died on Valentine's Day after he was assaulted the evening before near Ladbrokes in St Mary Street, Cardiff.
A 17-year-old youth and an 18-year-old man were arrested last Wednesday on suspicion of murdering Rhys.
Police are still appealing for witnesses to contact them.
Rhys was assaulted in the city centre near the Wharton Street junction at around 1840 GMT on 13 February.
He had been out shopping with a friend when it is thought he became involved in a row with some passers-by in St Mary Street while making their way to the bus station.
Senior investigating officer Det Supt Paul Burke said: "We know that Rhys and his friend had been in O'Neills public house in St Mary Street at the junction with Wood Street leaving the pub minutes before the incident and were walking up St Mary Street to catch a bus home.
"As they walked up the street they became involved in an argument with a white man and woman, and then three men described as having dark skin also became involved."
Officers still want to talk to a man who was riding a bike near the incident, who was wearing a dark donkey-style jacket with an orange tabard.
It is believed he held shopping bags belonging to Rhys's friend shortly after the incident and police believe he could have vital information.
Last week, South Wales Police set up a temporary police station outside the Ladbrokes shop which is remaining in place until Monday evening in an attempt to trace witnesses.
Det Supt Burke added: "The temporary police station in St Mary Street was extremely worthwhile and I would like to thank the public who have contacted us either at the mobile station or at the incident room.
"However we know from CCTV that there were many people in the area who have not yet come forward perhaps because they feel the information they have is insignificant, or [they are] worried.
"I would ask anyone who was in the vicinity of this incident to contact the incident room to help us bring those responsible to justice.
"Any information received will be treated in the strictest confidence."
Anyone with information is asked to attend the mobile police station, contact the incident room at Fairwater Police Station on 029 2057 1530 or call Crimestoppers anonymously on 0800 555 111.