A man who was fatally stabbed in Glasgow may have been targeted in a street robbery, police have said.
Michael Davis, 21, from the city's Germiston area, died in hospital after being stabbed in West Campbell Street at about 1935 BST on Wednesday.
Police have now been told that a man fitting the suspect's description was involved in threatening behaviour in nearby St Vincent Street beforehand.
The suspect is described as being of Chinese appearance.
He is said to be about 6ft 3in tall, of slim build with short black hair.
At the time of the attack he was wearing a dark beanie-style hat, waist-length zipped jacket and black woollen gloves.
Mr Davis was on his way to work when he was attacked.
Det Ch Insp David Gailey, of Strathclyde Police major investigation team, said: "Michael was the innocent victim of a random attack and it is imperative that we trace the man responsible for this crime.
"One witness has told police that he was approached by a man matching the description of the suspect in St Vincent Street near to West Campbell Street minutes before the murder.
"The man asked for directions for the nearest ATM machine and his demeanour made the witness feel uneasy and gave him the impression that he may be about to rob him.
"I am however keeping an open mind regarding the motive and I would appeal to anyone else who may have been approached by this man to come forward as a matter of urgency."
Detectives have set up an incident van in West Campbell Street in a bid to appeal to witnesses.
From Friday night, people passing within a 50m radius of the van will be sent a text message via bluetooth asking for anyone with information to come forward.
Police are studying CCTV footage from the area and are in contact with the city's Chinese community in a bid to trace the man responsible.