Heavy explosions have hit China's northern city of Tianjin, leaving at least 44 people dead and hundreds more injured. Chinese state news said the blasts started late after a container of "hazardous material" exploded in a warehouse shortly before midnight local time on Wednesday night. The blasts knocked doors off buildings in the area and shattered windows up to several kilometres away. Hospitals are reported to be overwhelmed with casualties and thousands of people have become homeless and are sleeping in the open air.
