'Several deaths' after twin-engine plane crashes at Florida airport

"You can hear the engine as it revved up and as the plane took off, and there's not one sign of the aircraft that was obviously soaked in a very dense, very heavy fog".

The plane was taking off just after 7 a.m. from Bartow Municipal Airport in a dense fog when it crashed and caught fire, said Polk County Sheriff Grady Judd.

Authorities identified the four passengers as Shannon's daughters, Olivia Shannon, 24, and Victoria Shannon-Worthington, 26; Shannon-Worthington's husband, Peter Worthington Jr., 27; and a family friend, Krista Clayton, 32, of Lakeland.

Shannon, who was a local attorney from Lakeland, filed a flight plan Sunday morning to fly to Key West, according to the sheriff's office.

Shannon-Worthington was a teacher at Baltimore International Academy Elementary/Middle School in Baltimore. For reasons that are still being investigated, but are likely related to the fog, it crashed shortly after takeoff. "It's a tragedy of monumental proportions when it happens on Christmas Eve".

The Polk County Sheriff's Office is handling the death investigations, deputies said.

The National Transportation Safety Board and Federal Aviation Administration investigators will probe the crash. No additional information about the pilot or passengers aboard the plane has been released.