A construction site accident in Framingham, Massachusetts, on Tuesday evening sent four workers to the hospital, according to the Framingham Fire Department.

Emergency responders arrived at the scene on Pearl Street around 5:15 p.m. after receiving reports of an incident on the fourth floor of a building currently under construction. Fire officials said four workers were found injured at the site.

“Three of the people's injuries are relatively minor, including cuts and bruises,” said the Framingham Fire Department. The three were transported to MetroWest Medical Center in Framingham for treatment.

A fourth worker sustained a back injury and required a more involved rescue. Fire officials used an aerial tower ladder to lower the injured person safely to the ground before transporting them to UMass Memorial Medical Center in Worcester for further medical attention.

The department did not disclose the specific circumstances surrounding the incident, stating that it remains under investigation. Details about what caused the injuries or how the incident unfolded have not yet been released.

The Occupational Safety and Health Administration (OSHA) has been notified and is expected to conduct a formal investigation to determine whether any safety violations occurred.

The construction site is part of a larger development effort in the downtown Framingham area, which has seen a surge in mixed-use and residential construction in recent years. Pearl Street, where the incident occurred, has several active projects.

Accidents on construction sites are not uncommon, but incidents requiring aerial rescues highlight the risks involved in multi-story builds. The use of tower ladders is typically reserved for situations where access is limited or patients cannot be moved safely using traditional methods.

Framingham authorities have not released the names of the injured workers, and it's unclear which contractor or subcontractor was managing the job site at the time of the incident.

OSHA's findings, once the investigation is complete, could provide more clarity and possibly lead to enforcement actions if workplace safety protocols were not followed.

“We’ll continue to monitor the situation and support the investigation,” said a spokesperson for the fire department.

Originally reported by NBC Boston.