Two Dunkin’ Donuts stores were robbed Monday night in Burlington and Bedford, police said. Burlington police K-9 officer Joseph Papsedero responded to both armed robberies, he said on his Twitter feed. Burlington police confirmed that a call for the robbery in their town came in shortly after 8 p.m. but had no further comment. Information on the Bedford incident was not immediately available. It was not known if anyone was injured at either store. There have been at least 21 robberies of Dunkin’ Donuts locations in Massachusetts since March.