NEW ORLEANS – The Coast Guard is responding to a barge breakaway and sinking on the Monongahela River near Pittsburgh, Pennsylvania, Thursday. Watchstanders at Coast Guard Sector Ohio Valley received a report that 14 loaded coal barges broke away from the Gulf Materials fleeting area in the vicinity of mile marker 10.3 on the Monongahela River. One barge subsequently sank at mile marker 8.9. The...