It is unclear how the incident happened, McNeil said. Firefighters responded around 1:15 p.m. Thursday to the Hub on Causeway project, Boston fire spokesman Brian Alkins said.

The ironworker, who is about 30 years old and was not identified, sustained lacerations on his face, a possible broken nose, and had back pain as a result of the fall, Boston Fire Deputy Chief Stephen McNeil said.

An ironworker was injured in a 12-foot fall on the 10th floor of a building site next to TD Garden Thursday afternoon, officials said.

The victim was awake when he was put into the ambulance around 2 p.m. Thursday and is in stable condition, Boston EMS Deputy Superintendent Steven McHugh told reporters at the scene.


“This is something we all collectively train for,” McHugh said.

Firefighters went up into the building and were able to get the man down with help from other construction workers and ironworkers, who operated a crane to bring down the victim. The victim, who was “conscious and alert,” McNeil said, was brought down in an alleyway on Legends Way.

Without the crane, firefighters would have had to use “ladders that are built on site, which is not the safest way necessarily to bring this individual down,” McNeil said.

At @tdgarden for construction worker injured on jobsite. @BostonFire & @BOSTON_EMS on scene. Reports that this will be an aerial rescue using a crane.#Boston25 pic.twitter.com/gYlsNTRyGl — Capturegirl (@jenyp) May 2, 2019

The man was then taken to an area hospital by Boston EMS, McNeil said.

The US Occupational Safety and Health Administration will be investigating the incident, McNeil said.

In March, a three-alarm fire broke out at the same site, causing $200,000 worth of damage, the Globe reported.

Globe correspondent Sabrina Schnur contributed to this report. Breanne Kovatch can be reached at breanne.kovatch@globe.com. Follow her on Twitter at @breannekovatch.