Recent incidents have resulted in injuries
The Island's police are warning of the dangers of tombstoning.
The Police Early Action Team says there have been incidents in recent days where youngsters have jumped from piers into harbours, resulting in injuries.
There is a particular concern over those jumping into Douglas, Ramsey and Peel harbours, as there could be a danger posed by ferries and fishing vessels.
Officers warn this is illegal and can result in serious injuries, including paralysis.

Almost 3,000 take part in Pilates world record attempt at Knockaloe
Ben-my-Chree sailing cancelled due to 'technical issues'
81 'unsafe squishy toys' seized
Manx Utilities open 'prior information notice' for Garff Sewage Treatment works