Police arrested a teen suspected in the carjacking of a senior citizen in a Silver Spring, Md., parking garage Monday.

An 84-year-old man was opening his black Lincoln Town Car in a garage in the 8500 block of 16th Street about 3:15 p.m. when two men approached and demanded his keys, police said. One pinned him against the car while the other took the keys from him.

The carjackers then drove out of the garage on to 16th Street, police said.

About 9:45 p.m. Monday, a plain-clothes officer saw a black Lincoln Town Car in Aspen Hill. The driver, who was alone in the car, fled the car when officers tried to stop it, police said.

About midnight, officers arrested 18-year-old Jamall H. Thorton of Silver Spring following a brief chase on foot near Connecticut and Georgia avenues, police said.

He is charged with carjacking, conspiracy to commit carjacking, robbery, conspiracy to commit robbery, motor vehicle theft, conspiracy to commit motor vehicle theft, unauthorized removal of property, second degree assault, obstruction and hindrance of a police officer, and associated theft charges.

Police are still looking for the second man, who is described as a black man in his early or mid-20s with a light complexion, a slim build and standing about 5-feet-9-inches tall.

Anyone with information about the second man or the case should contact Montgomery County police at 240-773-5070 or Crime Solvers at 866-411-TIPS (8477) or online.