Mining giant Rio Tinto apologized Monday as authorities in Western Australia searched for a tiny radioactive capsule that went missing in the vast Australian state.
Driving the news: A radiation alert was issued across parts of W.A. after the capsule containing a small amount of radioactive Caesium-137 vanished while being transported from Rio Tinto's Gudai-Darri mine in the remote Pilbara region to a storage facility about 870 miles away in state capital Perth, authorities said.