Here's what to know about a US couple missing in the Caribbean

SAN JUAN, Puerto Rico (AP) — Authorities in the eastern Caribbean are scouring waters in the region in hopes of finding a missing U.S. couple who were aboard their catamaran Simplicity more than a week ago when police say it was hijacked by three escaped prisoners from Grenada.

Police have said that Ralph Hendry and Kathy Brandel are presumed dead. The search for them began on Feb. 21 after someone discovered their catamaran abandoned on the shores of St. Vincent and alerted authorities.

Police say the three prisoners escaped from a police station on Feb. 18 and hijacked the catamaran a day later. Authorities said the prisoners then illegally entered the southwest coast of St. Vincent on Feb. 19 and docked the boat. Two days later, the three men were arrested along the island's northwest coast.

Here's what to know about the case:

WHY WAS THE COUPLE TARGETED?

It's unclear why the escaped prisoners hijacked the couple's catamaran, but it was moored at Grand Anse beach, near to the police station where the three men escaped.

Police believe the men hijacked the catamaran with the couple aboard and then allegedly threw them into the water while traveling to St. Vincent, which is located north of Grenada.

They have noted that there were signs of violence aboard the catamaran.

WHO ARE THE ESCAPED PRISONERS?

Police in Grenada have identified the escaped prisoners as Trevon Robertson, a 19-year-old unemployed man; Abita Stanislaus, a 25-year-old farmer; and Ron Mitchell, a 30-year-old sailor.

All were charged a couple of months ago with one count of robbery with violence. Mitchell also was charged with one count of rape, three counts of attempted rape and two counts of indecent assault and causing harm.

Vannie Curwen, Grenada’s assistant police commissioner, has said the men...