A San Francisco man was arrested in San Carlos after he was robbed at gunpoint of his car and 2 pounds of marijuana he tried to sell in the McDonald's parking lot Wednesday evening.

Thirty-three-year-old Jia Hang Li was arrested for possession and transportation of marijuana for sale Wednesday evening. Deputies from the San Mateo County Sheriff's Department San Carlos Police Bureau responded to a call from Li of a possible armed robbery at 8:40 p.m. Wednesday evening.

Li, who is in custody, told police he had driven from San Francisco in order to sell about 2 pounds of marijuana to a man whom he had never met, but had spoken with over the phone. The two men met in the McDonald's parking lot, at 180 El Camino Real.

The potential buyer -- described as a tall, dark skinned man in his 20s -- brandished a black handgun at Li then demanded his cellphone and car keys, according to a police report.

The unknown man stole Li's vehicle, which contained the drugs. Deputies found the unoccupied vehicle parked a few blocks away but the "buyer" was not found. A search of the vehicle resulted in police finding a bag containing 179 grams, less than half a pound, of weed.

Li was arrested but posted a $20,000 bond and is due in court March 26.

Police are still looking for the man who stole his car. Anyone with information should contact the San Mateo County Sheriff's Detective Bureau at (650) 599-1536 or the San Mateo County Sheriff's Office Anonymous tip line at (800) 547-2700.