Florida ? Two small planes collided over the Everglades on Saturday, crashing into the swamp, and authorities said there were likely no survivors.

A Piper aircraft and another plane believed to be a Cessna crashed at about 3 p.m., Federal Aviation Administration spokeswoman Kathleen Bergen said.

Authorities believe there was only one person on board the Piper. They were still determining how many people were on the second plane.

The area where the planes went down is only accessible by airboat, and the wreckage quickly sunk, said Palm Beach County Fire-Rescue Capt. Don DeLucia.

There were no survivors, DeLucia said, although no bodies had yet been recovered.