(Trends Wide) — The United States Coast Guard (USCG) is assisting Mexican Navy crews in the search for “three United States sailors, last heard from on April 4, near Mazatlán , Mexico,” according to a USCG news release.

The three people, identified as Kerry O’Brien, Frank O’Brien and William Gross, were aboard the Ocean Bound Sailboat, a 13-meter La Fitte, when they left the Mexican city of Mazatlán for San Diego, the USCG said. .

“The sailors planned to stop in Cabo San Lucas on April 6 to take supplies and report before continuing on to San Diego,” the news release said.

“However, there was no record of his arrival in Cabo San Lucas or a report of his location,” according to USCG officials.

“Search and rescue coordinators contacted the Baja California marinas,” but there were no sightings of the vessel, the press release said.

“Urgent maritime information transmissions have been issued over VHF radio requesting all sailors to keep an eye out for missing persons and the ship,” USCG said.

Coast Guard officials urge anyone with information about the sailors or the Ocean Bound sailboat to contact the USCG Search and Rescue Coordination Center at 510-437-3701.