At least five people were killed after two sightseeing airplanes carrying cruise ship tourists collided in midair Monday near a southeast Alaska town, the Coast Guard said.

Ten are injured with others still missing after the collision about 16 kilometers from Ketchikan, Coast Guard Lt. Brian Dykens said.

The Coast Guard had a cutter onsite and planned to work overnight to find the missing.

Initially reported by as three fatalities, the number has been revised up since the initial statement was made by Royal Princess Cruises describing an incident in which two sightseeing planes carrying 14 passengers collided.

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Emergency response crews transport an injured passenger to an ambulance at the George Inlet Lodge docks. Photo / AP
Emergency response crews transport an injured passenger to an ambulance at the George Inlet Lodge docks. Photo / AP

The National Transportation Board was sending an elite investigative team from Washington DC, to investigate the crash, another deadly mishap for cruise ship passengers taking side excursions off cruise ships in Ketchikan.

The floatplanes with passengers from Princess Cruises' Royal Princess ship collided under unknown circumstances, Federal Aviation Administration spokesman Allen Kenitzer said in an email to The Associated Press. Floatplanes have pontoons mounted under the fuselage so they can land on water.

Eleven people were inside Taquan Air's single-engine de Havilland Otter DHC-3 when it went down as it returned from Misty Fjords National Monument, which is part of the Tongass National Forest, the nation's largest. Ten were taken to a Ketchikan hospital.

All patients were in fair or good condition, according to Marty West, a spokeswoman for PeaceHealth Ketchikan Medical Center.

Three of the people who died were aboard the second plane, a single-engine de Havilland DHC-2 Beaver carrying five people, according to Dykens.

Local emergency responders worked with state and federal agencies and good Samaritan vessels to help rescue and recover victims.

"It's been a long day and the crews have been working really hard to rescue people and recover the deceased. They're still working on a search and recovery of three more individuals," Deanna Thomas, a spokeswoman for the Ketchikan Gateway Borough, the local government, said Monday evening.

All 14 passengers were on sightseeing flights. The plane with 11 on board was operated by Taquan Air. A spokeswoman for the flightseeing company said Taquan has suspended operations while federal authorities investigate the deadly crash.

Princess Cruises confirmed to NBC's KTUU that both planes carried passengers from two Princess cruise ships.

"We are devastated by today's incident and our hearts go out to our passengers and their families," Taquan said in a statement. "At this time, we are in the midst of an active crisis response, and our focus is on assisting these passengers, the pilot, our staff, their families and loved ones, and first responders."

Cindy Cicchetti, a passenger on the Royal Princess cruise ship, told the AP that the ship captain announced that two planes were in an accident Monday. She said the ship is not leaving as scheduled and there weren't any details as to how the accident will affect the rest of the trip.

Ketchikan is on a cruise ship route on Alska's southeastern coast. Photo / File
Ketchikan is on a cruise ship route on Alska's southeastern coast. Photo / File

The ship left Vancouver, British Columbia, on May 11 and is scheduled to arrive in Anchorage on Saturday.

"Our thoughts and prayers are with those who lost their lives and the families of those impacted by today's accident. Princess Cruises is extending its full support to traveling companions of the guests involved," Princess Cruises said in its statement.

Weather conditions in the area on Monday included high overcast skies with 14 kph southeast winds.

A pilot and eight cruise ship passengers died June 25, 2015, when a de Havilland DHC-3 Otter operated by Promech Air Inc. crashed into mountainous terrain about 38 kilometers from Ketchikan, also as it was returning from Misty Fjords.