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On Tuesday, several passengers aboard a flight in Japan were injured when they were forced to evacuate the plane before it took off due to smoke in the cabin.

According to Arata Yamamoto of NBCNews.com, Japan Airlines Flight 3512 was waiting on the snow-covered tarmac of New Chitose Airport in the Hokkaido Prefecture of Japan when an engine problem developed that began feeding smoke into the cabin.

The Boeing 737 was preparing to take off for its destination of Fukuoka at around 3 p.m. local time with 159 passengers and six crew members onboard when pilots discovered the mechanical issues with the aircraft’s right engine.

Once the crew realized the smoke and odors from the malfunctioning engine were backfeeding into the cabin, the pilot decided to evacuate the plane. During the deboarding process, four passengers suffered injuries that required further attention from medical officials.

The injuries sustained by passengers include two women—74 and 71 years old respectively—who suffered damage to their hips, a 67-year-old woman who hurt her neck and a 22-year-old man who complained of feeling sick.

The JACDEC Twitter account shared images of the incident in Japan:

evacuation of Japan Airlines #JAL Boeing 737 flight #JL3512 at Sapporo New Chitose Airport https://t.co/poQhqUXone pic.twitter.com/pdyXMVpuQM

— JACDEC (@JacdecNew) February 23, 2016

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