Update: At least 13 dead and hundreds injured in huge explosion in Chinese city

Update: At least 13 dead and hundreds injured in massive explosion in Chinese city

At least 13 people have been killed, and hundreds have been wounded in a massive explosion at a warehouse for dangerous materials in a major city in northeastern China.

Videos of the huge blast have been posted online, with footage showing a dramatic fireball inTianjin, which American researchers say could be seen from space.