UPDATE: William has been located unharmed, Suffolk Police said Thursday evening.

Original story: 

Police are asking for the public's help to find a missing Medford teen who suffers from bipolar disorder. 

William Fischer, 15, was last seen on Monday at 7 p.m. at the Long Island Rail Road station in Ronkonkoma when he was dropped off to go to school, according to Suffolk Police. 

William was wearing blue jeans and a black sweatshirt at the time, police said. He is 5-foot-8, weighs approximately 300 pounds and has brown eyes and brown hair.

Anyone with information on his location is asked to contact Fifth Squad detectives at 631-854-8552. 

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