A robber with a knife threatened a Novato store clerk and escaped with cash from the registers, police said Tuesday.

The crime was reported at about 11:30 p.m. Monday in the Loop market at the Shell gas station at 1390 S. Novato Blvd. Police were unable to find the robber.

The police department said the robber is white and about 6 feet tall and might have gray hair. He wore a black mask, green gloves, gray pants, gray shoes and a long-sleeved gray shirt. The shirt had an “Ice Bowl 2019” disc golf logo on the front.

Potential witnesses with information for investigators can email crimetips@novato.org or call 415-897-1122.