Detectives investigating an attack on a Paisley shopkeeper are looking to speak to a teenage girl seen nearby.
The injured man remained critically ill in hospital on Sunday after the attack, which happened on Friday at around 5pm.
Detective chief inspector Duncan Sloan, who is leading the investigation, said: "I am particulary interested in speaking to a female, described as in her late teens with dark hair wearing an apron, carrying Aldi carrier bags who was observed walking from the cycle track on Fulbar Road towards Green Road around the time of the attack.
"She may have seen something that could be relevant to our investigation."
The injured shopkeeper, who is 48, was working in Sunshine Licensed Grocers on Paisley's Green Road when he was attacked, according to Strathclyde Police. He was taken to the Royal Alexandra Hospital.
Forensic inquiries at the scene were continuing on Saturday.
Mr Sloan added: "Sunshine Grocers is a popular shop in the local community, so it is possible that someone may have either seen or heard the assault taking place."
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