Sheffield Hallam University has paid tribute to murdered pizza worker Thavisha Peiris who was fatally stabbed as he made his final delivery before starting a career as an IT consultant.
A spokesman said: "The university is saddened to hear of the tragic death on Sunday of Thavisha Peiris, who successfully graduated in 2011 with a degree in information technology.
"We encourage anyone with information to contact South Yorkshire Police."
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Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
Windy this weekend with gales across northwestern parts of the UK. Rain spreading southeast.
Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."