At least 21 killed & dozens hurt after explosion rips through firework factory as hundreds of firefighters battle blaze

AT LEAST 21 people are dead and 61 have been injured after a huge blast at a firework factory in China. The explosion erupted in the city of Changsha on Monday afternoon, according to state media. Almost 500 firefighters were deployed to the scene to tackle the inferno. A search and rescue operation was launched...