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Hurricane Igor Quickly Strengthens to Cat 4

Last Updated 2:45 p.m. ET

Forecasters say Hurricane Igor has rapidly strengthened to a Category 4 storm in the open Atlantic.

It doesn't immediately threaten land.

Meanwhile, a tropical depression off the coast of Africa prompted officials to issue a tropical storm warning for parts of the Cape Verde Islands on Sunday.

CBS News 2010 Storm Tracker

At 2 p.m. ET today Igor was centered about 1,120 miles east of the Northern Leeward Islands. It had maximum sustained winds of 135 mph and was moving west at 14 mph.

Some additional strengthening is expected in the next two days.

Forecasters at the U.S. National Hurricane Center also warned that the newly-formed depression could strengthen into a tropical storm as early as Sunday night.

The storm warning was issued for the southern Cape Verde Islands, including Maio, Sao Tiago, Fogo and Brava.

Forecasters warn rains could cause flash floods and mudslides in the islands.

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