"Armed officers attended due to the clear risk posed by three people reportedly carrying knives.
"Following a search of the area, officers were able to trace three individuals matching the suspect descriptions to St James’s tube station.
"Three boys matching the description were detained on the station platform. Following searches, two knives were found and boys, two 16-year-olds and one 15-year-old, were arrested for being in possession of an offensive weapon and robbery.
“They have since been bailed. Enquiries continue.”