HONOLULU (AP) — All five people aboard a small plane died in a fiery crash on Kauai Monday morning, officials said.

The plane crashed about 9:30 a.m. during a skydiving tour just outside Port Allen Airport, the Kauai Fire Department said in a statement. The pilot, two skydive instructors and two tandem jumpers were believed to be in the plane.

Four of them were pronounced dead at the scene, and one man was taken to Wilcox Memorial Hospital, where he was pronounced dead.

The National Transportation Safety Board will work with officials to determine the cause of the crash. The Federal Aviation Administration will also investigate.

The plane was a single-engine Cessna 182H that crashed under unknown circumstances, FAA spokesman Ian Gregor said. The plane caught fire after crashing, he said.

Gregor initially said it was a single-engine plane made from a kit. However, he later said he received wrong information.

A few hours later Monday off the coast of the island of Oahu, emergency responders took one person to a nearby hospital after a small aircraft crashed in the water off Makaha Beach Park.

County lifeguards brought two people to shore Monday from a single engine aircraft that was about 30 yards off the coast, Honolulu Fire Department Capt. David Jenkins said.

The other person in the airplane wasn't injured, Honolulu Emergency Services Department spokeswoman Shayne Enright said.