On Tuesday morning, a PLA Naval Air Force plane crashed to the ground during training exercises in Hainan province’s Ledong county.

Two pilots were killed in the crash. According to the Chinese navy, the incident caused no additional casualties on the ground. Footage from the crash site shows that the plane crashed into a field very near to some homes.

The cause of the crash is currently under investigation. However, such crashes are not uncommon in China, previously Chinese military planes have crashed into factories, property developments, and homes for reasons including “frequent nighttime training” and imported Russian engines.

These types of crashes are not publicly reported by the PLA unless they occur in a populated area, so it’s difficult to know exactly how frequent they are.

Last year, at least 12 crew members were reportedly killed when a new type of refueling plane crashed to the ground during training exercises in Guizhou province. Back in 2016, China’s first female J-10 fighter pilot was proclaimed a “revolutionary” martyr” following a fatal training accident.