The Bahamian helicopter crash that killed billionaire coal magnate Chris Cline, his daughter and five others, was headed to Fort Lauderdale for a guest’s medical emergency when it went down, according to a report.

Relatives called authorities when the chopper failed to reach Florida, where it was headed to deal with the issue, Delvin Major, chief of the Bahamian Air Accident Investigation Department, told the Palm Beach Post Friday. It’s unclear which passenger needed aid.

A major Republican donor worth $1.8 billion, according to Forbes, Cline was on board the chopper with his 22-year-old daughter, Kameron, when it dropped into the Atlantic Ocean minutes after taking off. At least three of the doomed passengers were friends of Kameron’s, a recent college graduate.

Cline, who started working in the West Virginia mines at the age of 15 before building his own empire, died a day before his 61st birthday.

The wreckage was discovered on the ocean floor about two miles off the coast of Cline’s private island.

The cause of the crash is under investigation. Meteorologists have said weather was not a factor.