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Nine construction workers were injured, three critically, after an on-ramp bridge that is being constructed along the 91 Freeway in Corona partially collapsed late Friday, officials said.

The partial collapse occurred about 11 p.m. as workers were lowering the bridge into place at East Grand Boulevard, according to a news release from the Riverside County Transportation Commission.

The jacking operation failed, which led to the bridge deck dropping more than a foot before it hit the wooden support beams. Those beams subsequently struck the workers, causing their injuries, the release stated.

Initially, the county Transportation Commission said 10 workers were injured, but revised that figure to nine in a later news release.

All of the injured workers were transported to local hospitals, officials said in the release.

One has been released, while three were in critical condition. The conditions of the other five workers has not been provided.

“The Riverside County Transportation Commission and the project team’s thoughts and prayers are with the injured workers and their families and ask that their privacy be respected. Project officials are continuing to monitor the condition of the construction workers,” officials said in the release.

An investigation into the incident was being handled by the California Occupation Safety and Health Administration.

East Grand Boulevard between Third and Joy streets would be closed to motorists until Monday, authorities said.

The 91 Freeway remained open.

The construction was part of the 91 Project, which is adding regular and tolled express lanes, as well as auxiliary lanes and direct express lane connectors between the 91 and 15 freeways.

All 91 Project work has been suspended through the weekend, according to the Transportation Commission.