A 170-foot crane at a construction site for the extension of the No. 7 subway line collapsed on Tuesday night in Manhattan, killing one worker and injuring four other people in an eerie reminder of two fatal crane accidents in the city four years ago.

It appeared that the accident occurred when the upper section of the crane broke off just before 7:30 p.m., during work on the extension at 34th Street, between 10th and 11th Avenues. A Fire Department spokesman said an 80-foot section and a 40-foot section from the crane fell.

It came down “like a dinosaur,” said a worker from the construction site who was waiting at Bellevue Hospital Center, where at least one victim was being treated.

One city official said there was some speculation among investigators at the scene that something in the back of the crane had snapped, causing it to become unbalanced.

Paul J. Browne, the Police Department’s chief spokesman, said a 30-year-old man had died and a 48-year-old man had been injured in the leg. A department statement early Wednesday identified the dead man as Michael Simmermeyer of Burlington, N.J.

The three other victims were a crane operator, a flag man and a relative of one of the victims, said Jackie Sullivan, deputy chief of the city’s Emergency Medical Services.

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