China's domestic security chief has labelled the incident at a morning market in Urumqi an act of "violent terrorism".
In recent months China has blamed a string of violent attacks on militant separatists from Xinjiang province.
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Detectives are investigating whether a 30-year-old man in Taunton died after taking 'spice', Avon and Somerset Police said.
Morgan Ackerman, 16, was playing "knock, knock ginger" with two friends when he ran out into the road and into the path of a taxi.
Dealers are adding deadly synthetic opioids which are hundreds of times stronger to batches of the class A drug, police have warned.