BANGOR — With more than one drug store robbery per week occurring in Maine, a drug store chain is posting security guards at its Bangor-area stores.

The Bangor Daily News said Friday that security guards are working a revolving schedule at Rite Aid pharmacies in Bangor, Brewer, Hampden and Bucksport.

Bangor’s most recent pharmacy robbery was Dec. 4 at a Walgreens, but four of the six pharmacy robberies in the city this year have occurred at a Rite Aid store. Rite Aid spokeswoman Ashley Flower said while security guards are on patrol, the company is working with police on ways to deter robbers in search of drugs.

Maine’s had 54 pharmacy robberies so far this year. The total is 30 more than occurred all of last year.