Thursday's flooding and devastating mudslides at the BHP-Vale mine in Minas Gerais involved two dams, not one as initially reported. Brazilian officials report the mud flow is eight kilometers (five miles) long and 2.5 meters deep. Those rescued – and emergency services – are being decontaminated; mining spoils being treated as toxic. There is no official information on the number of casualties or the cause of the incident. The company that runs the mine says it detected seismic activity right before the breach. Both BHP and Vale shares declined over five percent. Brazilian prosecutors have opened a criminal investigation.