A Delta Air Lines flight headed for Minneapolis returned to Japan because of some disruptive passengers, authorities said Tuesday.
Delta says the Boeing 747 was three hours into a 13-hour flight on Monday night when the decision was made to turn back to Japan, where the passengers were removed by Japanese authorities.
Narita International Airport police spokesman Keiji Shuto says two male passengers had locked themselves inside the airplane's restrooms for about an hour and refused to come out, prompting the attendants to force open the doors.
Shuto says airline officials found at least one plastic bag containing an unidentified liquid.
He says the men were questioned by Delta, but not arrested by police.
Reports said the pair, who identified themselves as Chinese citizens aged in their 20s, had boarded the flight during an earlier stop in Shanghai.
Japanese immigration officials said they did not have passports.
The one-liter container of liquid held by one of the passengers was later found to be neither toxic nor explosive, airport police said.© Copyright 2010 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.