Landing lights at an airstrip used by an island hospital to transfer patients to specialist care have been smashed by thrown stones.
Ashaig Airstrip on Skye is available 24 hours a day to Broadford Hospital for flying patients to larger hospitals in Inverness and Glasgow.
Police said three landing lights were vandalised sometime between 1230 BST on 30 June and 0930 BST on 2 July.
Northern Constabulary has appealed for information.
A spokesman said: "The landing lights allow aircraft to land at the facility during the hours of darkness and are an essential part of keeping the airstrip operating 24 hours a day.
"Police in Kyle of Lochalsh would be interested in hearing from anyone who may have information as to who carried out this senseless act of vandalism to an essential facility."