HONOLULU -- On Sunday, investigators plan to visit the waters where a tour helicopter crashed Friday, killing three passengers.

All of the victims were visiting the islands, according to officials.

Authorities said buoys mark the crash site. A senior National Transportation Safety Board investigator flew to Kauai Saturday night.

The tour helicopter went down offshore of Haena Beach Park Friday afternoon. It crashed about 600 yards offshore. Crews said the aircraft is now resting in about 15-20 feet of water.

"My little brother was talking to the pilot. They pulled him in. He was all OK," a witness said.

"We could see it smoking out there. You couldn't see the helicopter sticking out or anything, but you could see full-on smoke," another witness said.

Kauai police said two women and a man died. The pilot and another couple were treated and released by medical teams.

Heli-USA was closed for business Saturday. A worker there said it's not clear if the company will fly Sunday.

Heli-USA Vice President John Power said the there were two separate parties on board. He said the company's first priority is with the families of the victims and the survivors and its second priority is finding out what caused the crash.

Power said company officials are meeting with investigators. He said Heli-USA will fly family members of the victims to Kauai if they want to be there.

Residents said the weather was bad Friday afternoon. A Department of Transportation spokesman said the pilot reported wind shear just before the crash.

The Department of Transportation said debris from the wreckage is washing up on shore. Anyone who finds pieces of the wreckage is asked to turn it into the Princeville or Lihue airports.

Surfers Saturday complained they could smell the fuel leaking from the wreckage.

"Hopefully they'll be able to get it out of there before it leaks too much stuff out," one surfer said.

A team from Marine Corps Base Hawaii in Kaneohe helped in the rescue and recovery efforts on Kauai. The men got the call while training at the Pacific Missile Range facility at Barking Sands.

They were flying a Navy Seahawk helicopter and were able to retrieve two unconscious passengers from the water. The crew says the rough seas made rescue tricky.