MIAMI — A 20-foot-long chunk of construction crane plummeted 30 floors at the site of a high-rise condominium yesterday, killing two workers and smashing into a home that the contractor used for storage, police said.

Five other workers were injured, one critically, at the site of the 40-plus-story luxury condo tower on Biscayne Bay.

The part that fell was a section workers had been raising to extend the equipment’s reach, a spokesman from the Miami fire department, Ignatius Carroll, said. The crane’s main vertical section was intact.

The section smashed through the Spanish-tiled roof of the two-story home, was used in the 1998 comedy film “There’s Something About Mary,” a police spokesman, Delrish Moss, said.

Emergency workers and dogs found no evidence of trapped victims, but fire officials said rescue efforts were hampered because the crane section remained unstable. Rescue workers were trying to secure a severely damaged wall before re-entering the house to check for anyone inside.

A pipe fitter, David Martinez, 31, was on the fourth floor of the condo tower eating lunch when the crash occurred.

“It was like a small earthquake,” he said. “We looked outside, and we couldn’t even see.” It took several minutes for the dust to clear, Mr. Martinez said.

One of those killed died in the house, and the other died at a hospital, Mr. Moss said.