Detectives investigating the murder of 17-year-old Vaso Kakko in Holloway made an arrest yesterday.
The man, believed to be aged 20, was arrested in Bognor Regis, West Sussex, on suspicion of murder.
He was taken into custody at a Sussex police station and was due to be transferred to a south London police station.
The investigation continues.
Vaso, of Newington Green, was stabbed to death in Yoke Close, off North Road, last Monday night.
A post-mortem examination at Whittington Hospital Mortuary on Wednesday found the cause of death as a stab wound to the neck.
Anyone with information that may assist the investigation is asked to call 020 8721 4961. Alternatively, contact Crimestoppers anonymously on 0800 555 111 or at crimestoppers-uk.org
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