UPDATE: Police are hunting at least five youths who started a series of random attacks by assaulting a busker in a city mall on Saturday.

The youths, thought to be aged between 12 and 18, started abusing and throwing objects at the 48-year-old busker from a first-floor walkway as he was performing in Murray Street Mall, near Padbury Walk, about 5pm.

Police say the performer and his 44-year-old friend were assaulted when they approached the youths to talk to them.

The two men suffered minor injuries.

About an hour later the group was seen at the Liquorland bottle shop on Beaufort Street in Inglewood.

One of the youths removed two bottles from the shelf before leaving the store without paying.

Two of the youths in the group entered a Bedford fish and chips shop on Grand Promenade between 6.15pm and 6.30pm and allegedly stole bottles of soft drink before running away.

Two of the shop's staff members ran after the pair, chasing them on to Craven Street.

The two 25-year-old victims were then engaged in a verbal confrontation, before being assaulted by the offenders, who were also joined by additional members of the group.

One of the victims was kicked and spat on, while the other was assaulted with what police believe to be a piece of concrete.

He was treated in hospital for serious facial injuries.

Investigators would like to speak with the drivers and passengers of two separate vehicles observed in the area who might have witnessed the incident.

One of the vehicles is described as a white late-model Holden Commodore, while the second vehicle is believed to be a dark-green sedan.

Anyone with information is asked to call Crime Stoppers on 1800 333 000.