Webster Police are investigating an armed robbery. It happened just after 10pm on Tuesday at a Mobil Mart on Holt Road.

Police say they responded to a panic alarm and got there within about two minutes of getting the report.

Witnesses say a man with a large knife robbed cash from the business and took off in a maroon pickup truck.

There were no injuries. The suspect is described as a light skinned white male with a medium build.

Anyone with information is asked to call Webster Police.