Tuesday night, an accident took the lives of two patrolling border guards near coast of Haapsalu, West Estonia.
While investigations are underway, Police and Border Guard Boar director-general Elmar Vaher told Postimees the likeliest cause of death could be health failure.
The empty motor boat was found circling at full speed a couple of kilometers off the shore. The dead bodies of border guards were found near it a few hours later.
One, Tarmo Kammer, had been employed as border guard since 1996. His companion Renee Kark had been involved since creation of Estonian border guard in 1991.