Police are appealing for information after two life rings were deliberately set alight in the Marina in Annalong on Monday 16 March.
The damage was reported at around 6.30am.
A police spokesperson said: “Causing damage to such an important piece of equipment is unacceptable and shows a total disregard for the safety of the community in Annalong. Life rings could be the difference between life and death for a person, who may be in difficulty in the water.
“Police are keen to speak to anyone who may have witnessed this incident, including two persons spotted in the area at the time of the incident who may be able to assist police with their enquiries to contact police on 101 quoting reference 223 of 16/03/20. Alternatively, information can also be provided to the independent charity Crimestoppers on 0800 555 111 which is 100% anonymous and gives people the power to speak up and stop crime.