October 11, 2025

In a tragic and unexpected turn of events, a section of the Boston Celtics’ iconic TD Garden stadium collapsed this morning during a routine training session, injuring several team staff, including the head coach. Emergency crews responded swiftly to the scene as the collapse sent shockwaves through the sports community.

According to initial reports, the collapse occurred around 10:15 AM local time while the team was conducting off-season drills and physical evaluations. A large portion of the upper maintenance level gave way, sending debris crashing down near the Celtics’ practice area.

Head Coach Among Those Injured

Head Coach Joe Mazzulla was among those affected by the collapse. He sustained non-life-threatening injuries and was transported to Massachusetts General Hospital, where he is currently undergoing evaluation. Assistant coaches and training staff members were also injured, with at least three staffers reported in critical condition as of this writing.

No players were seriously injured, although some were present during the incident. A Celtics spokesperson confirmed that all players have been accounted for and are receiving support and counseling in the wake of the traumatic event.

Emergency Response and Investigation Underway

Boston Fire and Rescue responded within minutes, clearing debris and evacuating the facility. Authorities are now investigating the structural failure, with initial theories pointing to a possible fault in recent renovations carried out in the spring.

“We are doing everything we can to determine what caused this collapse,” said Boston Fire Commissioner Darryl Evans. “This could have been much worse, and we’re fortunate no lives were lost.”

The TD Garden will remain closed indefinitely while engineers and city officials assess the full extent of the damage.

NBA and Sports World Reacts

The NBA has issued a statement expressing concern and support for the Celtics organization:

“Our thoughts are with Coach Mazzulla, his staff, and the entire Boston Celtics family. We are in contact with the team and local authorities as more information becomes available.”

Fans and fellow teams have taken to social media to send messages of support, using the hashtag #CelticsStrong.

What Happens Next

With training camp preparations interrupted and key staff injured, the Celtics’ preseason schedule could be in jeopardy. The organization has not yet commented on how this will impact their upcoming season, but an official press conference is expected within the next 24 hours.

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