A number of high value items were stolen from within a rucksack on Lower Promenade, Port Erin, between 6.30pm and 8.30pm on August 7.
A number of bags had been placed on the sea wall opposite the wave shelters while a rugby training session took place on the beach.
The area is believed to have been busy at the time due to the fine weather.
Anybody who may have information relating to this crime or may have seen persons acting suspiciously in the area are asked to contact PC Arnold at Port Erin Police Station on 832222 or by email on robin.arnold@gov.im
