The Coast Guard continues to investigate the grounding and sinking of two barges on the Hudson River near the Bear Mountain Bridge in Bear Mountain, N.Y., after the two barges broke free of the Tug Buchanan 12. The Buchanan 12 was pushing 13 scow barges when two broke free. A scow barge is a flat bottomed, square bilged vessel that typically carries rocks, gravel, dirt, and other similar loose products. The tug's master immediately notified the Coast Guard Sector New York Command Center on Staten Island, N.Y. The Coast Guard issued a broadcast notice to mariners, dispatched an inspector and an investigating officer, and notified the U.S. Army Corps of Engineers. The tug master reported that the barge B2002 lost most of its cargo of crushed stone after breaking free of the tug.