The National Weather Service (NWS) said buses were "currently evacuating people from the area as quickly as they can".

At least 13 people have died on the US territory since Maria ripped through Puerto Rico, devastating homes and knocking out the island's electricity.

The island's governor has called it the worst storm in a century.

Operators of the Guajataca Dam said the dam, located at the northern end of Lake Guajataca in northwest Puerto Rico, failed at 14:10 local time (18:10 GMT).

It sparked a flash flood emergency for Isabela and Quebradillas municipalities, the NWS said in a series of tweets.

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