The serious attack on the 45-year-old woman was almost certainly a bull shark (based on locale, multiple bites and severe injuries/amputation).
The other event involving the 2 teenage girls is hard to evaluate based on the limited info in the article ...could be one or more bull sharks; but, other species are also possible. Hopefully forensic examination will “nail down” the exact species (bite marks, tooth fragments, etc.).
I'm betting water temperatures in the area are above normal for this time of year; which appears to amplify aggression in bull sharks.
They should bring in Matt Hooper to analyze the bite radius.