The search has been suspended for six people aboard a plane that went missing off Nantucket over the weekend, the Coast Guard announced Sunday night.

"We express our deepest condolences to the families and loved ones," the Coast Guard said in a social media post.

The update came after searchers found a “debris field” off the coast of Nantucket from an air ambulance that was carrying six people when it vanished over the Atlantic on Saturday during a flight from Bermuda to Boston.

Four Canadians and two Bermudian nationals were aboard, and their next of kin were notified.

The company that operated the plane, Latitude Air Ambulance, acknowledge the Coast Guard’s decision on Sunday night to transition to a recovery effort for the plane, Heartbeat 104 Medieval.

Latitude said the update mans “we must now face the heartbreaking reality that the four members of our Latitude team, our patient and the patient's family escort, who were aboard Heartbeat 104, are presumed to have died.”

The six people presumed dead haven’t been publicly identified, but Latitude called its crew valued members of the company who were dedicated to helping others.

“We are grieving their loss deeply and will continue to support their families and our employees through the difficult days ahead. We extend that same care and compassion to the family and loved ones of our patient and family escort,” the statement said.

At a press conference on Sunday morning, U.S. Coast Guard Rear Admiral Matthew Lake said they had been searching since 2 a.m. Saturday, using fixed wing aircraft, helicopters, boats and cutters. They said they had searched over 2,800 square miles over nearly 54 hours.

But after 66 hours of searching, the Coast Guard decided to stop their search.

Ed Freni, former director of aviation at Massport, spoke with NBC10 Boston on Sunday morning about the search for a missing aircraft off Nantucket.

According to the Coast Guard, the Federal Aviation Administration reported that the Gulfstream G100 lost contact very early Saturday morning. Air traffic audio indicates that it may have been “coming in blind” when a storm loomed ahead shortly before it vanished.

The pilot reported electrical problems and declared an emergency as the jet approached the coast, according to air traffic control audio posted by LiveATC.net. “Roger, you said you’re coming in blind. Is that what you said?” a controller can be heard asking the pilot.

That makes Mary Schiavo, who is a former Inspector General of the Transportation Department, think the plane may have lost its navigational instruments just as a storm moved across its path on radar. The plane also descended sharply from its cruising altitude of around 24,000 feet to around 10,000 feet, according to preliminary data from flight tracking site FlightRadar24.

“Something bad happened with this big drop, and they flew into this big storm. It’s a terrible place to have a loss of your instruments and be flying blind,” said Schiavo, who is an aviation attorney. “It’s very easy to get disoriented and not know if you’re turning, climbing, descending, etc.”

The search continues on Sunday for a missing medical plane off the coast of Nantucket. The medical plane was headed to Logan Airport from Bermuda.

The Canadian-registered air ambulance jet had four crew members and two passengers aboard when it departed Bermuda’s L.F. Wade International Airport for the nighttime flight to Massachusetts, according to a statement from the Bermuda airport's operator, Skyport.

Transport Canada was closely monitoring and working with authorities, the country’s Minister of Transport Steven MacKinnon said on the social platform X.

The National Transportation Safety Board said it was gathering information about the situation, but it did not say immediately if it would investigate.

Associated Press reporter Laura Turbay in Little Rock, Arkansas, a corps member for The Associated Press/Report for America Statehouse News Initiative, contributed to this report. Report for America is a nonprofit national service program that places journalists in local newsrooms to report on undercovered issues.

This story originally appeared on NBCBoston.com.