AUGUST 21 (Reuters) — Rescue work continued on Thursday in the central zone of last week’s blasts in north China’s Tianjin Municipality, while a cyanide producer sent teams to help clean up the site. To determine whether it was safe to carry out the clean-up operation, a chemical defense troop retrieved and tested samples from the site. A cyanide producer that supplied 700 tons of the cyanide involved in the blasts sent 140 people to […]