I am 10 miles away. You can smell it in the air. The sky is black above us. This is what it looks like (massive):
It's a large polyurethane factory, but it has a builders merchants backing on to it. My postman lives almost next door to it, and his wife has been evacuated by the Police. She said there have been huge explosions and some workers are reported missing.
Edit, put a scaled down image in.