Someone must not be happy about the Celtics’ or Bruins’ post-season performance.

Two office employees at TD Garden, home to both teams, told police they heard “two loud smacks” Friday morning and found two windows with “glass shattered like a spiderweb.”

They called police to report the incident and officers arrived at around 10:35 a.m. and looked at the windows. The police report notes that the two double-paned windows looked to be shot “possibly with a BB-gun or pellet gun and that the glass was shattered like a spiderweb.”

And this wasn’t the first time.

A very similar police report was written on June 1, when police responded to the building a little after 1:20 p.m. for a report “of a person that had shot the window on the second floor of the TD Garden possibly with a BB-Gun and the glass was shattered.”

In both cases, the windows were ones that faced Zakim Bridge and the only real difference is that the first time the employee described the sound a little differently.

“(Redacted) stated that he was sitting in his computer chair on the second-floor office space when he heard a THUD noise coming from an office cubicle near the window facing out towards the Zakim Bridge and turned around and observed a large, shattered window with a small hole on the right side,” the report for the June 1 incident reports.

Likewise, police responding to each incident searched the area and found no bullet fragments or casings.

No injuries were reported in either incident.