Philadelphia Mayor Michael Nutter had harsh words on Wednesday for the National Rifle Association’s call to plant armed guards at every school in the country, citing the Dec. 24 shooting attack on firefighters in Webster, New York as proof the group’s proposal was untenable.

“[A] guy sets a fire, firefighters come, and he basically tries to take target practice, and picks off a number of them, killing two, injuring another two, damaging other people’s homes,” Nutter said. “I guess, out of last week’s bizarre press statement — it wasn’t a press conference — I guess Mr. [Wayne] LaPierre would say that firefighters need to have armed guards go with them. I think it just shows that that was a completely dumbass idea from the start.”