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While the plane was waiting on the tarmac of Seattle-Tacoma International Airport, a second person was removed from the flight for "unruly behaviour", authorities said.

A second person, who allegedly knew the customer taking part in the private sale, entered the store and pepper-sprayed the owner, according to police.

A second person, a 38-year-old man, was taken to a hospital in the incident, Los Angeles Fire Department Spokesperson Margaret Stewart said.

Two people were taken to the hospital where one was listed in critical condition and the second person — described as a woman in her 30s — was pronounced dead, police said.

She is the second person to be identified through Operation Identify Me - a campaign launched by global policing agency Interpol to find the names of dozens of unidentified women found dead in Europe.