MENDENHALL, Miss. (AP) — Three construction company employees remained hospitalized in critical condition Thursday, a day after a bridge collapsed while they were preparing it for demolition in a rural area of central Mississippi, a sheriff said.

A construction company said Thursday that it is cooperating with local authorities' investigation of how a bridge in rural Mississippi collapsed while some of its employees were preparing the structure for demolition.

Three people were killed and at least three others were seriously injured when a bridge, which was being prepared for demolition, collapsed in a “work site accident” in Mississippi on Wednesday afternoon,