A Swiss International Airlines plane from Zurich to Beijing was forced to turn back Sunday after two Chinese passengers fought above Moscow, local media reported Monday.

The fist fight between the two passengers, aged 29 and 57, took place when the Airbus A340 was preparing for a stopover in Moscow after more than six hours of flight, the World Radio Switzerland reported.

They were arrested by the police of the canton of Zurich. Zurich Cantonal Police spokesperson Werner Schaub said alcohol clearly played a role.