gCaptain reports, “The U.S. Coast Guard Cutter Key Largo collided with the 42-foot commercial fishing vessel Sea Shepherd (not that Sea Shepherd–Chuck) earlier today (Sept 23, 2014–Chuck), sinking the vessel approximately nine nautical miles east northeast of Vieques, Puerto Rico according to a USCG report.”
Presumably we will hear more about this.
Chuck Hill's CG Blog 
Some information of the three investigations (NTSB and two CG investigations) to be conducted into the incident: http://www.uscgnews.com/go/doc/4007/2298506/
First results expected in November.