Volunteers searched for a missing Galveston teen on Sunday.
Police said Jason Hamilton, 15, has been missing for almost a week.
Texas EquuSearch said the teen has been off his medication. Police said Hamilton left a note with his family saying he was running away.
Dickinson police said this is the second time police have searched for Hamilton since February.
Hamilton has brown hair, is 5 foot 8 inches tall and weighs about 130 pounds. He was last seen wearing dark jeans, a T-shirt featuring the band Pantera with a white shirt underneath and blue and white tennis shoes.
Texas EquuSearch asked for volunteers to report to a command center at 4400 Orange Street in Bacliff.
Anyone with information on the missing teen is asked to call Dickinson police at 281-337-4700.