Concrete floor explodes while group of friends have barbecue in southeastern China

This is the moment a concrete floor exploded while a group of friends were having a barbecue in southeastern China.

CCTV footage taken in Puning City in Guangdong province on February 10 shows the group huddled around a table while a man cooked the meat on a grill. The floor under the hot coals then appeared to explode, spewing out sparks and sending everyone fleeing in panic.