Australia learned about Chinese live-fire naval drills off the country’s coast that forced dozens of flights to be diverted via an alert from a commercial pilot, authorities said on Monday.

China’s Defense Ministry says that Australia made “unreasonable accusations” and deliberately hyped the situation after three planes headed to New Zealand changed course in midflight because of live-fire drills by the Chinese navy.

Australia's defense forces, joined by New Zealand, have been monitoring Chinese navy vessels since they were spotted last week.