Ernesto strengthens into hurricane as it approaches Bermuda

Satellite image provided by National Oceanic and Atmospheric Administration shows Hurricane Ernesto northwest of San Juan, Puerto Rico and moving over open water (NOAA/AP)

Hurricane Ernesto strengthened into a Category 2 storm on Thursday night as it moved toward Bermuda, after leaving hundreds of thousands of people in Puerto Rico without power or water.

A hurricane warning was in effect for Bermuda with Ernesto expected to pass near or over the island Saturday.