Miami ? Part of a construction crane plummeted 30 floors at the site of a luxury high-rise condominium Tuesday, smashing into a home that the contractor used for storage and killing two workers, police said.

Five workers were injured, including one in critical condition, officials said. The other four had injuries not considered life-threatening.

The crane’s main vertical section was intact, but the part that fell was a 20-foot section that workers had been raising to extend the equipment’s reach, Miami fire spokesman Ignatius Carroll said. It fell 30 floors and smashed through the home’s Spanish-tiled roof.