Authorities in the eastern Caribbean said they were trying to locate two people believed to be US citizens who were aboard a yacht that was hijacked by three escaped prisoners from Grenada.
The Royal Grenada Police Force said in a statement released on Friday that they were working on leads “that suggest” the two occupants of the yacht might have been killed.
“This investigation is in its infancy stage,” police said.
The nonprofit Salty Dawg Sailing Association identified the owners as Ralph Hendry and Kathy Brandel.
It said they were “veteran cruisers” and longtime members of the association, calling them “warmhearted and capable”.
A relative of Hendry didn’t return a message seeking comment on Saturday.
The association said a cruising skipper had contacted the association about a member’s yacht, Simplicity, that was found “anchored and abandoned” off a beach on the island of St Vincent.
“The good Samaritan had boarded the boat and noted that the owners … were not onboard and found evidence of apparent violence,” the association said in a statement on Thursday.
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The association said Hendry and Brandel had sailed the yacht in last year’s Caribbean Rally from Hampton, Virginia, to Antigua, and were spending the winter cruising in the eastern Caribbean.
“This is a very upsetting event and details are still unconfirmed by the authorities, but this does appear to be a tragic event,” said Bob Osborn, the association’s president.
“In all my years of cruising the Caribbean, I have never heard of anything like this.”
Family members of those missing met with authorities in St Vincent on Saturday, where they were seen boarding the yacht that was hijacked. It was being guarded by officials, one of whom was wearing latex gloves.
Hendry’s family issued a statement on Saturday thanking police, local coast guards and all those who helped authorities gather information.
“It means so much to us that so many people cared for Ralph and Kathy as friends and fellow cruisers that they are willing to stop and help in whatever way possible,” the family said.
They also asked that all those trying to conduct independent searches to “stand down”.
“The only way we feel this situation could be worse would be if anyone was hurt or endangered trying to conduct searches,” the family said.
Authorities in Grenada said they had dispatched senior investigators and a forensic specialist to the nearby island of St Vincent, where the escaped prisoners were arrested on Wednesday.
The prisoners, ages 19, 25 and 30, were charged a couple of months ago with one count of robbery with violence.
The eldest inmate also was charged with one count of rape, three counts of attempted rape and two counts of indecent assault and causing harm, police in Grenada said.
The three men escaped from their holding cell February 18, according to police.
Authorities said a preliminary investigation suggested the three men seized the yacht at Grenada’s capital, St. George’s, and traveled to St Vincent.