UPDATE: The remains of six people were recovered Friday at the site of a tour helicopter crash on a Hawaiian island, a fire official said.

There were no signs of any survivors among the seven people on board, said Solomon Kanoho, battalion chief of the Kauai Fire Department. He made the announcement Friday afternoon, hours after crews found the wreckage along the remote north coast of the island.

The search was suspended Friday due to fog and poor visibility. Kanoho said more searches will hopefully resume Saturday at first light.

"There are no indications of survivors," Kanoho said, adding the wreckage was in a steep area.

The tour helicopter was reported overdue at around 6 p.m. Thursday. The Safari Helicopter was conducting a tour over the Na Pali area with a pilot and six passengers on board, officials said.

Kauai is an island west of Oahu.

The last contact anyone had with the helicopter was around 4:40 p.m. Thursday when the pilot reported the tour was leaving the Waimea Canyon area, Kauai County officials said.

The aircraft had been scheduled to return around 5:30 p.m. at the landing pad in the town of Lihue.

The names of those whose remains were found were not released because officials were still notifying their families, Kanoho said. The Coast Guard had said their were two minors aboard.

Kanoho said earlier Friday that there were members of two families onboard, a party of two and a party of four.

Hawaii Gov. David Ige said in a statement earlier Friday that “Our thoughts are with the families of those on-board as search and rescue crews work at the site of the helicopter crash on Kaua?i.”

The National Transportation Safety Board said it was sending three investigators to the scene of the crash.

Ige said the state would do whatever it could to assist with the investigation.

Eighty percent of the island is uninhabited. Most of it is a state park, and visitors aboard tour helicopters from several companies are a daily occurrence, weather permitting, the Coast Guard said.

The Waimea Canyon is among several attractions that draw tours there, the agency said.

Derek Kawakami, mayor of the County of Kauai, said Friday afternoon that "we ask for your continued thoughts and prayers."

The cause of the crash has not been determined, but it is the third helicopter crash in Hawaii this year, NBC affiliate KHNL of Honolulu reported.

U.S. Rep. Ed Case, a Democrat who represents a district in Hawaii that includes Honolulu, said in a statement Friday that more must be done to regulate the tour and small-aircraft industries and improve safety.

In September, Case introduced a bill he said would impose strict regulations on commercial tour operators, including helicopters and small planes. It would require that tour flight pilots focus on flying the aircraft and not also act as tour guides. It also would restrict where they can fly and how low.

"Tour helicopter and small aircraft operations are not safe, and innocent lives are paying the price," Case said in a statement Friday.

The FAA said it conducts random and regular surveillance on all Hawaii air tour operators and ensures companies address any issues. Ian Gregor, a spokesman for the Federal Aviation Administration, told The Associated Press the agency does not have concerns about the industry statewide.

PREVIOUS STORY: The U.S. Coast Guard was searching for an "overdue" tour helicopter carrying seven people, two of them believed to be minors, that has gone missing off the coast of Hawaii.

"The weather conditions are challenging," said Petty Officer 1st Class Robert Cox in a statement. "We have trained crews responding and on scene searching for any signs of the helicopter and those aboard."

The owner of the helicopter raised the alarm at 6:06 p.m. (11:06 p.m. ET) Thursday, according to the statement. The helicopter carrying one pilot and six passengers, which had been touring Kauai's Napali Coast, had been due back at 5:21 p.m.

Kauai is an island west of Oahu, which is where Honolulu is located.

While the aircraft is equipped with an electronic locator, no signals had been received, according to the Coast Guard.

More searches are scheduled at first light, the Coast Guard said. Eighty percent of Kauai is uninhabited and most of it is a state park, the guard said.

The Coast Guard said that rain and clouds were keeping visibility to around 4 miles, and winds were 28 mph.