Amen Teklay was found seriously injured on Clarendon Street in the Scottish city at around 10.30pm on Wednesday night.
Police and paramedics arrived but the boy was pronounced dead at the scene.
A 14-year-old and 15-year-old, both boys, have been arrested in connection with the death, police said this morning.
The force said on Friday that following a post-mortem Amen’s death is being treated as murder.
Detective Superintendent Cheryl Kelly said: “Our thoughts are with the Amen’s family and friends at this distressing time.
“We will continue to provide specialist support for them as our investigation continues.
“We are still keen to speak to anyone who was in the area at the time and anyone who has dash cam, private CCTV or doorbell footage around the time of the incident.”
Amen was a pupil at St Thomas Aquinas Secondary in the city.
He was a bright pupil with an interest in music and media, his headteacher Claire McInally said.
“This is a tragic situation. Our thoughts and prayers are with Amen’s family and friends at this devastating time,” she said.
“Amen was a friendly and much-loved young man who was really interested in music and the media. He was bright and showed great promise.
“This has been a shock for our school community, and we are continuing to offer support to our young people, staff and those in the wider community who are affected.”
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