From the Associated Press: "Killer Nile Crocodiles in Florida?"

Below are two excerpts from this article:

     Step aside, Burmese python — you may no longer be Florida's scariest invasive species. Researchers have confirmed that three Nile crocodiles were captured near Miami, and they say it's possible more of the man-eating reptiles are still out there, although no one can say for sure.
     The big question now: How did they get to Florida?
     "They didn't swim from Africa," University of Florida herpetologist Kenneth Krysko said. "But we really don't know how they got into the wild."

[and. . .]

     Nile crocs are believed to be responsible for up to 200 fatalities annually in their native sub-Saharan Africa. Compare that with an annual average of six reported shark attack deaths globally.