Joanna Revis, 38, was last seen snorkeling near the shoreline of Punta Arenas in Vieques, Puerto Rico about 1 p.m. Wednesday, officials said.
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She was wearing a long-sleeved white shirt and black shorts.
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A U.S. Fish and Wildlife officer reported the incident to the Coast Guard about 7:15 p.m. Wednesday, and San Juan-based officials deployed helicopters and a patrol boat to search through the night and into the morning for the woman.
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Other emergency agencies are also helping in the search.
Anyone with information on the case should contact the Coast Guard Sector San Juan Command Center at 787-289-2041.