Sesame Street, the American children`s television series, had its YouTube account hacked on Sunday, with hackers replacing child friendly movies with hardcore porn.

All videos of Bert & Ernie and friends were deleted, the design was modified and graphic porn was uploaded instead, according to The Next Web.

A message in the video website informed the visitors that the show page had been shut down “due to repeated or severe violations of our community guidelines.”

The bad content was available for about 20 minutes until YouTube realized the error and Google pulled the content down and closed the channel.

The hackers changed the title of the kid’s TV show to “Sesame Street, it’s where porn lives.” Supposedly the author was a user called MrEdxwx, a gamer who uploads gameplay footage.

"WHO DOESN'T LOVE PORN KIDS? RIGHT! EVERYONE LOVES IT! I'M MREDXWX AND MY PARTNER MRSUICIDER91 ARE HERE TO BRING YOU MANY NICE CONTENT! PLEASE DON'T LET SESAME STEET TO GET THIS ACCOUNT BACK KIDS," the channel's hacked profile stated.

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But the user MrEdxwx has denied all responsibility.

"I did not hack Sesame Street. I am an honest youtuber. I work hard to make quality gameplay videos AND MOST IMPORTANT I RESPECT THE COMMUNITY GUIDELINES," said Mredxwx on his YouTube page.

YouTube representatives said the removal of the content was in accordance with user guidelines.

"YouTube's Community Guidelines prohibit graphic content," a YouTube spokesperson said. "As always, we remove inappropriate material as soon as we are made aware of it."

Sesame Workshop issued a statement on Sunday afternoon apologizing for the breach and said that the channel was compromised and they were working with YouTube/Google to restore the original content.

"We always strive to provide age-appropriate content for our viewers and hope to resolve this problem quickly."

It is assumed that kids as young as five may have seen the videos.