A man who died after being detained by police in Derbyshire has been named online as Chad Allford.
Derbyshire Police are yet to formally confirm the identification of the 23-year-old, who died an incident in Alfreton on Wednesday night.
But images on social media showed graffiti on an electrical substation saying "RIP Chad" with several floral tributes laid, Derbyshire Live reports.
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Derbyshire Police said the force has referred itself to the Independent Office for Police Conduct (IOPC), the police force watchdog, and an investigation is ongoing.
In a statement, the force said: "Just before 5pm last night, Wednesday 27 October, officers attended an address on Morewood Drive in Alfreton.
"A 23-year-old man was detained who became unwell, he was taken to hospital by ambulance where he later sadly died.
"The force has referred itself to the Independent Office for Police Conduct.
"Any further media enquiries are to be directed to them."
Tributes have been paid on social media to Mr Allford, who was described as "one of the nicest lads".
One post said: "Really can't believe it. You was one of the nicest lads growing up. I'll never forget the times we had mate. You always stuck up for me in school and I'll always be grateful to you for that cuz. Doesn't seem real. Rest in peace Chad, my thoughts are with your family and little boy."
Others who knew him said he was "one of the soundest blokes I had the privilege of knowing" and a "top lad".
Another said: "Rest in peace Chad Allford, had a lot of good times growing up."
Several posts contained the hashtag "#JUSTICEFORCHAD".
A vigil has been planned at Morewood Drive for 6:30pm on Thursday evening, with guests encouraged to bring a drink in memory of Mr Allford.
