Hurricane Irma packing more punch on way to NE Caribbean, perhaps Fla.

SAN JUAN, Puerto Rico -- Officials across the northeastern Caribbean canceled airline flights, shuttered schools and urged people to hunker down indoors as Hurricane Irma barreled toward the region as a powerful Category 4 storm expected to strengthen more before nearing land late Tuesday and early Wednesday.Irma had sustained top winds of 150 mph early Tuesday, the U.S. National Hurricane Center said.States of emergency were declared in Puerto Rico, the U.S. Virgin Islands and all of Florida wh