The 20- to 25-tower cranes now in use in Miami were created to withstand 145-mile-an-hour winds, city officials said last week.
The cranes were among two dozen such heavyweight hazards looming over the city skyline as the monster storm powered across the state.
In Miami, Jackson Health System alerted women who are at least 34 weeks pregnant or who have a high-risk pregnancy that they may take shelter in one of three of its hospitals, as long as they have registered with the hospital in advance. The equipment was created to withstand winds up to 145 miles per hour, city officials said.
A crew will be dispatched to secure the crane as soon as weather conditions improve, developer Ryan Shear, a principal of Property Markets Group, said in an emailed statement.
"This particular crane, some of it was taken down", Jorge Perez, chief executive of The Related Group, Miami's largest developer, said by telephone.
The first collapse occurred Saturday morning at the under-construction building at 300 Biscayne Blvd.
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If high-rise dwellers choose to stay, officials said the safest place in a high-rise building to ride out a hurricane is an interior, concrete-enclosed stairwell.
At least 25 people have died from the storm so far throughout the Caribbean, while there are three reported deaths on the United States mainland.
Officials calling for more than 6 million people in Florida and Georgia to evacuate in advance of Irma's storm surge and fierce winds.
As Hurricane Irma threatened catastrophic damage to Florida, patrons at the most infamous South Beach dive bar tossed back drinks, shot pool and played the jukebox loud.
The boom of the crane snapped off and is now still connected to the tower, but is hanging off the side of the building. "Consider that the counterbalances on tower cranes weigh about 20,000 to 30,000 pounds".
The horizontal arms of some cranes were left loose to spin in the winds.
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