Northern Constabulary beat officers in impromptu gig
Footage of two police officers playing electric guitar and the drums in their uniforms has emerged on the internet.
The officers had gone into the town's Caledonian Hotel as part of a routine patrol in Stornoway on Lewis.
Members of the band A Promise to No One asked the officers if they wanted to play during one of their songs.
A police spokesman said officers dealt with serious matters but added that it was also "good to show a lighter side of community policing".
The Northern Constabulary officers had been on patrol during the Royal National Mod in October last year.
The festival celebrates Gaelic language, culture and history.
A Promise to No One is a band with members from Lewis and Harris that plays hard rock.
Camera phone footage of the officers' guest appearance has now been uploaded on to Facebook.
The police spokesman said: "We have a community policing style in the Highlands and Islands second to none.
"Public confidence and good will are fundamental to successful police work and helps us to have the lowest crime and highest detection rates in the UK.
"Although we are a small force in numbers, we have a lot of very talented people working for Northern Constabulary and some are very good musicians. Indeed, the chief constable is a keen piper and very active in the pipe band."
He added: "As police we have to deal with some very serious matters and it is good to show the lighter side of community policing."