An Asiana Airlines flight to London made an emergency landing in Russia on Monday after a smoke alarm went off. No injuries or casualties were reported.

According to reports, flight OZ521 landed at Khanty-Mansiysk airport in central Russia at 10:50 p.m. following an alarm that smoke was detected near the engines. The incident happened about eight hours after the flight left Incheon International Airport at around 2:50 p.m.

The plane landed safely and 197 people on board were unharmed. Russian officials inspected the aircraft but did not find any trace of fire.

Asiana said the company would further investigate the case to find out the exact cause, but suggested it could have been an error with the smoke detection device.

Meanwhile, the country's second-biggest airline came under fire for letting a co-pilot injured in a fight operate a flight bound for New York from Seoul last week.

Amid criticism for risking passengers' safety, the company said the fight happened outside the cockpit and that Asiana's safety director confirmed that the pilot could safely operate a flight.