Bahamas, Sept. 3 -- Hurricane Dorian unleashed massive flooding across the Bahamas on Monday, pummeling the islands with so much wind and water that authorities urged people to find floatation devices and grab hammers to break out of their attics if necessary. At least five deaths were blamed on the storm.

"We are in the midst of a historic tragedy," Prime Minister Hubert Minnis said in announcing the fatalities. He called the devastation "unprecedented and extensive."

The fearsome Category 4 storm slowed almost to a standstill as it shredded roofs, hurled cars and forced even rescue crews to take shelter until the onslaught passed.

Officials said they received a "tremendous" number of calls from people in flooded homes. A radio statio...