The incident happened near Gleneagles Close on the Ise Lodge estate in the town on Saturday night (February 16).
The 16-year-old boy was on his way home from a party with friends when two masked offenders approached them and demanded they hand over ‘whatever they had’.
The victim gave them a small amount of cash, but when he got out his phone to try to call one of his friends the robbers returned, pulled out a large knife and held it to the boy’s stomach.
They forced the boy to give them his phone, after which he managed to get away.
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When he got home he found blood on his jumper from a cut to his finger.
The robbers were driving a small silver car, possibly a Corsa.
Police are appealing for witnesses to call them on 101.
The three teenagers questioned have been released on bail pending further inquiries.