HACKENSACK, N.J. — A glass canopy fell off a high-rise condominium building and onto a parking garage two stories below today, partly flattening the structure and trapping at least one person, authorities said.

Rescuers could see the victim but could not get to the person because they were concerned about the possibility of another collapse at the three-story garage, Hackensack fire Lt. Stephen Lindner said. They could not determine the victim's condition.

Authorities are checking out reports that two to three more people might also be trapped, Lindner said.

The garage pancaked when the canopy fell on it, damaging vehicles. Television footage showed the top level of the garage littered with dirt, debris and glass, and wide cracks in the pavement.

It's unclear why the canopy fell from the 22-year-old building, which is adjacent to the garage. Several residents said workers had uprooted a tree between the street and the building within the past few months, and that a leak in the basement was being fixed.