WESTMINSTER, Colo. -- Narcotics have been stolen from two ambulances in the last month while the emergency crews were in fire stations in Westminster, officials said Tuesday.

The second theft happened Tuesday morning, and Deputy Chief Bill Work said it was causing additional concern because fire department uniforms also were stolen.

"Now we fear thieves may be impersonating fire personnel to aid in the thefts,” Work said.

On Jan. 26, narcotics were stolen from the locked cabinets of an ambulance at Westminster Fire Station #6 at 999 W. 124th Ave. Tuesday morning's theft was at Fire Station #2 at 9150 Lowell Blvd.; ambulance narcotics and fire apparel were taken.

Westminster fire officials said at least four neighboring jurisdictions have had similar station break-ins and thefts.

Work is asking people to call 911 if they see suspicious activity around their local fire station.

"This is compromising the public safety services we provide, and the perpetrators need to be stopped,” Work said.

Anyone with information about the burglaries is asked to call Westminster police Detective Wright at 303-658-4231.