Firefighters take part in an emergency rescue drill in a forest in Taian city, Shandong province, on Feb 24, 2019. This is the country's largest joint air-ground drill with around 2,000 rescuers, seven helicopters and vehicles, and over 1,200 firefighting equipment taking part in the exercise. [Photo/IC]

Helicopters queue on runway during an emergency rescue drill in Taian city, Shandong province, on Feb 24, 2019. [Photo/IC]

Firefighters take part in an emergency rescue drill in a forest in Taian city, Shandong province, on Feb 24, 2019. [Photo/IC]