China blasts: Tianjin port city rocked by explosions

Massive explosions have hit China's northern city of Tianjin, leaving at least 17 people dead and hundreds more injured. 

State media said the blasts happened in a warehouse storing dangerous and chemical goods in the port area of the city. 

Pictures and video on social media showed flames lighting up the sky, and buildings are said to have collapsed. 

Hospitals are reported to be overwhelmed with casualties. 

BBC