A concrete pour gone wrong on Friday caused a building under construction near the Yale School of Medicine in New Haven to partially collapse, injuring seven people, two of whom were critically hurt, according to city officials. However, no one died in the incident.

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At a news conference, Mayor Justin Elicker revealed that the victims were construction workers at a seven-story residential structure when a section of the second floor fell. Critical, potentially fatal wounds have been found on two of the victims. The location was staffed by 36 individuals in total.

City firefighters and other authorities were called to Lafayette Street shortly after 12:30 p.m.

“Our units responded immediately within minutes and found several persons in varying degrees of injury, from broken bones to three that were partially buried under the rubble,” Fire Chief John Alston Jr. said during a news conference. “Those persons that were trapped had to be lifted out.”

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“They were doing a concrete pour on this building and as they were pouring concrete a portion of the second floor collapsed onto the first floor and then into the basement,” Mayor Justin Elicker said.

Elicker stated that RMS Companies, based in Stamford, Connecticut, is transforming the property into a seven-story residential structure that will be owned by Yale. RMS Companies describes itself as a builder of “upscale, modern apartments and luxurious boutique hotels” on its website.

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Currently, the structure has two stories and two underground parking levels. According to Elicker, the plans provide for 112 residential units.

“There will be a significant investigation as with any construction situation like this,” the mayor said. The scene has been investigated by Occupational Safety and Health Administration investigators. According to city officials, a stop work order will be issued at the location until it is secure.