Four people were injured after a steel beam collapsed at a Yale University construction site on Monday, the Hartford Courant reports.

Jessica Mayorga, a spokeswoman for the New Haven mayor's office, said four construction workers were injured when the beam fell Monday morning at the planned air conditioning center.

A Yale-New Haven Hospital spokesman said two men being treated there are in critical condition and one is in serious condition.

A fourth person is being treated at the Hospital of Saint Raphael for injuries considered not life-threatening.

A crane was helping to install the roof of a building being renovated when part of the roof collapsed at around 10 a.m., a fire dispatcher told CTnow.com. The dispatcher reportedly said that the crane had nothing to do with the collapse.

A beam fell on one of the workers, who was then pinned, according to Mayorga.

The federal Occupational Safety and Health Administration (OSHA) and New Haven officials are investigating.

The building is reportedly being built for Yale University and will be used for air conditioning and cooling.

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The Associated Press contributed to this report