Two floatplanes collide under unknown circumstances carrying cruise ship tourists near Ketchikan town in Alaska.
Two seaplanes carrying cruise ship tourists have collided mid-air over southeastern Alaska, killing at least five, injuring 10 and leaving one person missing.
The accident occurred on Monday afternoon over waters about 40km northeast of Ketchikan town, said Petty Officer Jon-Paul Rios, a coast guard spokesperson.
The floatplanes collided under unknown circumstances, Allen Kenitzer, the Federal Aviation Administration (FAA) spokesman, said in an email to the Associated Press.
Weather conditions in the area on Monday included high overcast skies.
Floatplanes have pontoons mounted under the fuselage so they can land on water.
Local emergency responders worked with state and federal agencies and good Samaritan vessels to help rescue and recover victims.
The passengers were from the cruise ship Royal Princess and were on sightseeing flights.
The ship left Canada's Vancouver city on May 11 and was scheduled to arrive in the city of Anchorage in Alaska 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 a statement.
The FAA and the National Transportation Safety Board are investigating.
The Washington DC-based investigative team from the National Transportation Safety Board is expected to arrive in Ketchikan on Tuesday afternoon, agency spokesperson Peter Knudson said.
He said board member Jennifer Homendy also is traveling with the so-called "Go Team", which investigates major accidents.
The crash site, which the FAA said was at Coon Cove near George Inlet, lies in the vicinity of a popular tourist lodge that runs excursions to the nearby Misty Fjords National Monument, about 480 km south of Juneau, Alaska's capital.
One of the aircraft involved was a de Havilland DHC-2 Beaver with five people aboard, and the other was a de Havilland Otter DHC-3 carrying 11 people, FAA spokesperson Allen Kenitzer said in an email message, citing information from local authorities.
The Ketchikan-based operator of the larger plane, Taquan Air, said its pilot and nine passengers were rescued and receiving medical attention, but one passenger's fate remained unknown.
That group was returning from a flightseeing tour of Misty Fjords when the crash occurred, Taquan said in a statement.
A spokesperson for Taquan Air, operator of the Otter, said the company had suspended operations while federal authorities investigate the deadly crash.
It is not the first time a major plane crash has occurred near Ketchikan, a popular tourist destination.
In June 2015, a pilot and eight passengers died when a de Havilland DHC-3 Otter operated by Promech Air Inc crashed into mountainous terrain about 39km from Ketchikan.
The NTSB later determined that pilot error and lack of a formal safety programme were behind the crash.