The city fire commissioner during the Sept. 11, 2001 terror attacks urged Mayor Zohran Mamdani to skip Friday’s 25th anniversary memorial ceremony, claiming his presence will offend victims’ families.

“It’s a rough day. The families don’t need any more angst and Mamdani is going to bring angst,” ex-FDNY boss Tom Von Essen told The Post.

Von Essen, who saw 343 of his firefighters die trying to rescue people from the World Trade Center towers following the terror attacks, referred to a recent action by Mamdani as another slight against the families.

“Mamdani had the pen for his 9/11 executive order handed to his attorney [Ramzi Kassem]” — who…

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