UPDATE: He was found safe, his GPS unit pinging, at the Savin Hill Red Line stop around 1:30 p.m.
The autistic teen from East Boston was last seen yesterday around 8 a.m. He's 19, 6' tall and 150 lbs., has short brown hair and wears glasses. He likes to ride the T, so might be on a train platform somewhere.
He was wearing a GPS device, but it hasn't pinged any police receivers yet.