No survivors found after firefighting helicopter crashes into Florida marsh

There were four people aboard the helicopter, authorities said.

There is one confirmed death at this time, the Leesburg Fire Department, which responded to the scene, said in a statement around 9 p.m. Tuesday.

"The crash appears to be a total loss," the department said. "No survivors have been located."

A fire at the scene has been largely brought under control, and the U.S. Forest Service was working to prevent any vegetation fires, the Leesburg Fire Department said.

The National Transportation Safety Board is leading the investigation of the crash.

ABC News' Mina Kaji contributed to this report.