The wreckage of a helicopter carrying seven people to one of the most rugged and remote coastlines in Hawaii was found Friday in a mountainous area on the island of Kauai, authorities said.

Officials said in a news release that they’re sending additional resources and searching for possible survivors of the crash.

Searchers began looking for the helicopter carrying a pilot and six passengers after it was reported overdue from a tour of Kauai’s Na Pali Coast on Thursday evening. Two passengers are believed to be minors, the Coast Guard said.

This photo provided by the Hawaii Department of Land and Natural Resources shows a Coast Guard search and rescue team looking over Napali Coast State Wilderness Park for a tour Helicopter that disappeared in Hawaii with seven people aboard on Friday, Dec. 27, 2019. Authorities say the helicopter's owner called for help about 45 minutes after the chopper was due back from a tour of Kauai's Na Pali Coast on Thursday evening. (Dan Dennison/Hawaii DLNR via AP)
This photo provided by the Hawaii Department of Land and Natural Resources shows a Coast Guard search and rescue team looking over Napali Coast State Wilderness Park for a tour Helicopter that disappeared in Hawaii with seven people aboard on Friday, Dec. 27, 2019. Authorities say the helicopter’s owner called for help about 45 minutes after the chopper was due back from a tour of Kauai’s Na Pali Coast on Thursday evening. (Dan Dennison/Hawaii DLNR via AP)

Steep terrain, low visibility, choppy seas and rain had complicated the search, the agency said.

This photo provided by the Hawaii department of Land and Natural Resources shows an area over Napali Coast State Wilderness Park where search and rescue are searching for a tour Helicopter that disappeared in Hawaii with several people aboard on Friday, Dec. 27, 2019. Authorities say the helicopter's owner called for help about 45 minutes after the chopper was due back from a tour of Kauai's Na Pali Coast on Thursday evening. (Dan Dennison/Hawaii DLNR via AP)
This photo provided by the Hawaii department of Land and Natural Resources shows an area over Napali Coast State Wilderness Park where search and rescue are searching for a tour Helicopter that disappeared in Hawaii with several people aboard on Friday, Dec. 27, 2019. Authorities say the helicopter’s owner called for help about 45 minutes after the chopper was due back from a tour of Kauai’s Na Pali Coast on Thursday evening. (Dan Dennison/Hawaii DLNR via AP)

The helicopter company, identified as Safari Helicopters, contacted the Coast Guard about 6 p.m. Thursday to say the aircraft was about 30 minutes overdue, authorities said.

According to a preliminary report, the pilot relayed that the tour was leaving the Waimea Canyon area, known as the Grand Canyon of the Pacific, about 4:40 p.m., which was the last contact with the helicopter, Kauai police said.

In this photo released by the U.S. Coast Guard, Coast Guard Incident Command Post responders look over a map of the Na Pali Coast State Wilderness Park on the Hawaiian island of Kauai on Friday, Dec. 27, 2019, the day after a tour helicopter disappeared with seven people aboard. Authorities say wreckage of the helicopter has been found in a mountainous area on the island. (Senior Chief Justin Shackleford/U.S. Coast Guard via AP)
In this photo released by the U.S. Coast Guard, Coast Guard Incident Command Post responders look over a map of the Na Pali Coast State Wilderness Park on the Hawaiian island of Kauai on Friday, Dec. 27, 2019, the day after a tour helicopter disappeared with seven people aboard. Authorities say wreckage of the helicopter has been found in a mountainous area on the island. (Senior Chief Justin Shackleford/U.S. Coast Guard via AP)

A person who answered the phone at a number listed for Safari Helicopters declined to comment and hung up.

The Eurocopter AS350 had lifted off from the town of Lihue, Federal Aviation Administration spokesman Ian Gregor said in an email to The Associated Press.

The helicopter has an emergency electronic locator transmitter, but no signals were received. Gregor said the locator devices are designed to activate when an aircraft crashes.

In this photo released by the U.S. Coast Guard, a coast guard vessel searches along the Na Pali Coast on the Hawaiian island of Kauai on Friday, Dec. 27, 2019, the day after a tour helicopter disappeared with seven people aboard. Authorities say wreckage of the helicopter has been found in a mountainous area on the island. (Lt. j.g. Daniel Winter/U.S. Coast Guard via AP)
In this photo released by the U.S. Coast Guard, a coast guard vessel searches along the Na Pali Coast on the Hawaiian island of Kauai on Friday, Dec. 27, 2019, the day after a tour helicopter disappeared with seven people aboard. Authorities say wreckage of the helicopter has been found in a mountainous area on the island. (Lt. j.g. Daniel Winter/U.S. Coast Guard via AP)

The FAA requires the locators to be able to withstand impact. However, it is possible for the device to become inoperable from an extreme crash and a signal can be shrouded if an aircraft is in a deep canyon or gorge, Gregor said.

He said the agency is looking at the company’s safety record but likely won’t have a full report until Monday. It’s investigating along with the National Transportation Safety Board.

The helicopter was found in a mountainous region inland from the Na Pali Coast, which is one of the most dramatic and sought-after destinations in Hawaii and was featured in the film “Jurassic Park.” Towering mountains with deep ravines and huge waterfalls make up the interior of the uninhabited state park. Red rock cliffs with thick jungle canopies rise from the Pacific Ocean to over 4,000 feet (1,219 meters) high.

This photo provided by the Hawaii department of Land and Natural Resources shows an area over Napali Coast State Wilderness Park where search and rescue are searching for a tour Helicopter that disappeared in Hawaii with several people aboard on Friday, Dec. 27, 2019. Authorities say the helicopter's owner called for help about 45 minutes after the chopper was due back from a tour of Kauai's Na Pali Coast on Thursday evening. (Dan Dennison/Hawaii DLNR via AP)
This photo provided by the Hawaii department of Land and Natural Resources shows an area over Napali Coast State Wilderness Park where search and rescue are searching for a tour Helicopter that disappeared in Hawaii with several people aboard on Friday, Dec. 27, 2019. Authorities say the helicopter’s owner called for help about 45 minutes after the chopper was due back from a tour of Kauai’s Na Pali Coast on Thursday evening. (Dan Dennison/Hawaii DLNR via AP)

Hawaii Department of Land and Natural Resources spokesman Dan Dennison, who has spent years visiting and photographing the area, said winter brings more rain and turbulent seas.

In this photo released by the U.S. Coast Guard, Coast Guard Cutter William Hart moves toward the Na Pali Coast on the Hawaiian island of Kauai on Friday, Dec. 27, 2019, the day after a tour helicopter disappeared with seven people aboard. Authorities say wreckage of the helicopter has been found in a mountainous area on the island. (Lt. j.g. Daniel Winter/U.S. Coast Guard via AP)
In this photo released by the U.S. Coast Guard, Coast Guard Cutter William Hart moves toward the Na Pali Coast on the Hawaiian island of Kauai on Friday, Dec. 27, 2019, the day after a tour helicopter disappeared with seven people aboard. Authorities say wreckage of the helicopter has been found in a mountainous area on the island. (Lt. j.g. Daniel Winter/U.S. Coast Guard via AP)

“During the winter, flash floods frequently close the trail out of safety concerns,” he said. “It has numerous streams that can rise very fast.”

The weather is the primary challenge to any search-and-rescue operation in the area, Dennison said.

Rescuers resumed searching Friday for a tour helicopter carrying seven people that disappeared while traveling to one of the most rugged and remote coastlines in Hawaii. (Dec. 27)
Rescuers resumed searching Friday for a tour helicopter carrying seven people that disappeared while traveling to one of the most rugged and remote coastlines in Hawaii. (Dec. 27)

“You can have very low ceilings. You can have fog and cloud banks that move in very quickly. You can have heavy rain and strong winds that make flying difficult if not impossible at times,” he said.

The shoreline has beaches that could potentially serve as emergency landing zones, but they are “few and far between,” Dennison said.

And even the beaches that are there would be a tight spot to land a helicopter.

In this photo released by the U.S. Coast Guard, Coast Guard Cutter William Hart moves toward the Na Pali Coast on the Hawaiian island of Kauai on Friday, Dec. 27, 2019, the day after a tour helicopter disappeared with seven people aboard. Authorities say wreckage of the helicopter has been found in a mountainous area on the island. (Lt. j.g. Daniel Winter/U.S. Coast Guard via AP)
In this photo released by the U.S. Coast Guard, Coast Guard Cutter William Hart moves toward the Na Pali Coast on the Hawaiian island of Kauai on Friday, Dec. 27, 2019, the day after a tour helicopter disappeared with seven people aboard. Authorities say wreckage of the helicopter has been found in a mountainous area on the island. (Lt. j.g. Daniel Winter/U.S. Coast Guard via AP)

Finding a safe place to land in the interior wilderness would be much more difficult, Dennison said, and searching those areas from the air is also a challenge.

“It’s such a vast area with so many ins and outs and pockets of vegetation,” he said. “It’s just really hard to see from the air through the heavy canopy.”

This Dec. 17, 2019, aerial photo shows the Na Pali Coast on the island of Kauai in Hawaii. The Coast Guard is searching for a tour helicopter that disappeared on the Na Pali Coast with seven people aboard on Thursday, Dec. 26, 2019. Authorities say the helicopter's owner called for help about 45 minutes after the chopper was due back from the tour. (AP Photo/Maryclaire Dale)
This Dec. 17, 2019, aerial photo shows the Na Pali Coast on the island of Kauai in Hawaii. The Coast Guard is searching for a tour helicopter that disappeared on the Na Pali Coast with seven people aboard on Thursday, Dec. 26, 2019. Authorities say the helicopter’s owner called for help about 45 minutes after the chopper was due back from the tour. (AP Photo/Maryclaire Dale)
This Dec. 17, 2019, aerial photo shows a waterfall on the Na Pali Coast on the island of Kauai in Hawaii. The Coast Guard is searching for a tour helicopter that disappeared on the Na Pali Coast with seven people aboard on Thursday, Dec. 26, 2019. Authorities say the helicopter's owner called for help about 45 minutes after the chopper was due back from the tour. (AP Photo/Maryclaire Dale)
This Dec. 17, 2019, aerial photo shows a waterfall on the Na Pali Coast on the island of Kauai in Hawaii. The Coast Guard is searching for a tour helicopter that disappeared on the Na Pali Coast with seven people aboard on Thursday, Dec. 26, 2019. Authorities say the helicopter’s owner called for help about 45 minutes after the chopper was due back from the tour. (AP Photo/Maryclaire Dale)
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