MONTREAL — Organizers of a Montreal-area puppet show found themselves apologizing to the public after a song about prison rape was performed during a family-friendly show where children were present.

They said a series of errors led to the song, "Prison Bitch,'' being played during the open-air festival in the Verdun borough last weekend.

"We sincerely regret the discomfort experienced by the parents who were present, as well as for having lacked vigilance over the entire contents of our show,'' Promenade Wellington said in a statement.

A video posted online shows several children watching and one dancing along to the song as two puppeteers manipulate a puppet onstage.