Police are warning workers in Coquitlam convenience stores about a man with a handgun who has begun robbing small businesses in the area.

RCMP Cpl. Jamie Chung says a number of similar-sounding robberies have been reported to police beginning in mid-April.

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Police say a masked robber caught on a security camera man be targeting convenience stores in and around Coquitlam. (RCMP)

In each incident, a tall and slim man walks in and demands money from the cashier. In some cases, the robber shows the cashier a black handgun.

"This is all the information we are able to share at this point," Chung said in a written statement.

"We are urging those who work at corner store-typed small businesses to be extra vigilant and to call 911 if you see anything suspicious."

Police say the suspect may also have committed similar robberies in the surrounding area.