A tall, thin gunman held up a La Mesa gas station early Monday, according to the La Mesa Police Department.

The robber entered the Arco station at 9600 Murray Drive about 1:30 a.m., showed the clerk a semi-automatic handgun and demanded money and cigarettes, police said.

The clerk followed the suspect outside and saw him drive away west on Murray Drive in a white, newer model sedan, police said.

The robber, described as about 6 feet 4 inches tall, wore a gray ski mask and gray zip-up hoodie.

Anyone with information about the holdup was asked to contact San Diego County Crime Stoppers anonymously at 1-888-580-8477, or send an email to sdcrimestoppers.com.

A reward of $1,000 is available for information that leads to an arrest.