A Congressman joined in the search for Michael Karwan early Sunday morning in Times Square.

Congressman Michael Grimm (R-Staten Island)

Staten Island Representative Michael Grimm (R), a friend of the Karwan family and a former FBI agent told ABC 7 that the autistic 19-year-old from Marlboro who has been missing since Tuesday and off his medications may be functioning as a child.  "Although Michael is high functioning, he is out of his element and obviously very scared, so he may be functioning right now at a 7-year old capacity, so he's going to be very scared," said Grimm.

A $25,000 reward is being offered by Karwan's father Walter for information leading to Michael's safe return.

Grimm told WPIX TV that Karwan boarded a NJ Transit bus bound for the Port Authority  Bus Terminal but was very restless and unsure of himself according to the driver. There are a number of things that could draw him to Manhattan including his father's office and his favorite comic book store. Michael is a fan of comic books and movies.

The search focused on businesses and places open 24 hours where Karwan may be trying to keep warm. He left his Marlboro home on Tuesday after an argument over schoolwork with his parents.

He is 19 years old, 6' tall, weighing 220 lbs., with brown eyes, and black hair, wearing a black jacket and yellow-green shoelaces on his dark sneakers. He may have a beard as well. There is a $25,000 reward for his safe return.

Anyone sighting Michael should call NYPD’s Crime Stoppers Hotline at 800-577-TIPS or the Marlboro Township Police Department at 732-536-0100.