The Sesame Street characters. (SESAME WORKSHOP)

“Sesame Street’s” YouTube channel appears to have been hacked on Sunday, with news outlets reporting that content on its page was replaced by pornographic videos. said the page was removed from YouTube on Sunday afternoon. It was unclear how long the content had been up. San Francisco’s ABC affiliate, KGO-TV, reported that one of the adult videos was eight minutes long, but that none of them included “Sesame Street” characters.

The YouTube page for the beloved, long-running children’s television program was still down as of 11:15 p.m. Sunday.

“We apologize for any inconvenience our audience may have experienced today on our Sesame Street YouTube channel,” Sesame Workshop, which produces the show, said in a statement Sunday night.  “Our channel was compromised and we are presently working with YouTube/Google to restore our original content. We always strive to provide age-appropriate content for our viewers and hope to resolve this problem quickly. “

A YouTube user who uses the name MrEdxwx posted a video Sunday that said he or she was not the person responsible for putting pornographic material on “Sesame Street’s” channel. Some comments had been posted on his page blaming him for the hack.

“Please understand i did not hack sesame street , i RESPECT youtube community guidelines !” the user wrote under an 18-second video that said he was not responsible for the hack.

The show’s YouTube channel was in the news last year after Sesame Workshop pulled video of Katy Perry singing with Elmo.