Maria has killed at least 10 people as it raged through the Caribbean region, the second major hurricane to do so this month.

It ripped roofs off almost all structures on the island country of Dominica, where seven people were confirmed dead and the number is expected to climb when searches resume at daybreak.

Maria was ranked a Category 4 storm, near the top end of the five-step Saffir-Simpson scale, with sustained winds of up to 155 miles per hour (250 km per hour), when it hit Puerto Rico on Wednesday as the strongest storm to hit the U.S. territory in nearly 90 years.

It tore roofs from buildings, snapped power lines and turned roadways into torrents laden with debris as it cut a diagonal swath across the island.

Read: Hurricane Maria Strikes Puerto Rico

The entire island of 3.4 million people was under a flash flood warning early on Thursday as the storm was forecast to dump 20 to 30 inches (50 to 76 cm) of rain on much of Puerto Rico through Friday, according to the U.S. National Hurricane Center.

The island's governor, Ricardo Rossello, said the only fatality immediately reported was a man struck by a piece of lumber hurled by high winds.

"It's nothing short of a major disaster," Rossello said in a CNN interview, adding it may take months for the island's electricity to be completely restored. Earlier he imposed a dusk-to-dawn curfew for the island.

The streets of Puerto Rico's historic Old Town in the capital, San Juan, were strewn with broken balconies, air conditioning units, shattered lamp posts, fallen power lines and dead birds. Few trees escaped unscathed.

The island's recovery could be complicated by its financial woes as it faces the largest municipal debt crisis in U.S. history. Both its government and the public utility have filed for bankruptcy protection amid disputes with creditors.

Maria weakened as it went over land in Puerto Rico and picked up strength early on Thursday as it passed over warm Caribbean waters.

It was a Category 3 storm with maximum sustained winds of 115 mph (185 kph) about 55 miles (90kms) north of Punta Cana, on the east coast of the Dominican Republic, at 2 a.m. EDT (0600 GMT), the NHC said.

Punta Cana was hit with wind gusts of 58 mph (93 kph) and Maria was forecast to bring storm surges, when hurricanes push ocean water dangerously over normal levels, of up to 6 feet (1.83 m) in the Dominican Republic, it said.

Hurricane Maria was expected to pick up strength as it churns toward the Turks and Caicos Islands and the southeastern Bahamas later on Thursday. Storm surges on the islands could be as high as 12 feet (3.66 m), it said.

REUTERS