Police say he follows his victims into apartment buildings, then attacks and robs them.
The suspect has struck three times since February in the Baychester section.
He's described as a black teenager, around six feet tall with a medium build. He was seen wearing a black hoodie and carrying a North Face back pack.
Anyone with information is asked to call Crimestoppers at (800) 577-tips (8477). You can also text tips to crimes (274637) then enter tip577.
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