A KLM Royal Dutch Airlines passenger aircraft from Amsterdam made an emergency landing Saturday morning at New Chitose Airport in Hokkaido after reporting engine trouble, airport authorities said.
Flight 861 bound for Narita, a Boeing 747-400 service with 284 passengers and crew members onboard, reported the trouble to the transport ministry's airport office at around 6:30 a.m. and requested that it be allowed to divert.
The aircraft landed at New Chitose, which serves Sapporo, about one hour later.
Passengers were unloaded and cleared immigration there and flew to Tokyo's Haneda airport on a substitute flight. No injuries were reported.
KLM and other sources said the crew shut down one of the four engines about 360 km west of Wakkanai, Hokkaido, after the aircraft reported a fuel leak.
However, an inspection after the landing found no leak, prompting officials to speculate an instrument malfunction, they said. The cause of the incident is under investigation.