Tropical Storm Irene nears Puerto Rico
Storm could be season's 1st Atlantic hurricane by Monday
Northwest path over Caribbean could threaten Florida
Puerto Rico governor urges residents to take shelter (Updates storm strength, position, adds quotes)
SAN JUAN, Puerto Rico, Aug 21 (Reuters) - Tropical Storm Irene strengthened as it barreled across the Caribbean toward Puerto Rico on Sunday on a course that could take it to Florida later in the week.
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