SAN JUAN, Puerto Rico — The U.S. Coast Guard has established a Safety Zone Regulation surrounding the waters of Flamenco Bay in Culebra, Puerto Rico from 9a.m. to 12p.m. Sunday in anticipation of the underwater detonation of a War World II explosive. Persons and vessels are prohibited from transiting through, anchoring in, or remaining within the Safety Zone unless authorized by the Captain of the...