
Salvage teams are currently at the scene of the incident on the G30 expressway in China's Henan province. The blast took place at 8:52am local time (00:52 GMT), Chinese state news outlet Xinhua reported, citing local officials.
The massive explosion threw six vehicles into a ravine 30 meters below the raised highway; the survivors were retrieved by emergency teams.

The Ministry of Public Security dispatched a team to the site of the explosion to establish the cause of the blast, Xinhua reported.
In 2006, a fireworks storeroom exploded in Henan province, killing 36 people.
The highway accident has once again drawn attention to Chinese road safety, which has recently been under discussion. Earlier this month, the Chinese government delayed plans to introduce harsher punishments for traffic violations after complaints from the public.
Fatal road accidents are quite common in China. In 2011, over 60,000 people died on China's roads in accidents that were largely attributed to lax safety regulations.
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I am wondering if maybe the bridge failed and then the fireworks truck exploded when it hit the ground?