Police say a 16-year-old was attacked when two people tried to rob him on Rabbit Run near Ellen Street early Nov. 1.
They say one of the attackers had a knife and the other demanded his cellphone.
The attackers punched the victim in the head several times before running away empty handed, police say.
They say one of them is a 15-year-old who lives at the Timothy Hill Ranch in Riverhead, which is a facility for troubled teens.