It was not a particularly sunny day on Sesame Street's YouTube channel Sunday, after hackers temporarily hijacked the channel with adult content, including pornography.

For a brief period on Sunday, children and adults who visited the YouTube channel in search of Elmo and the Cookie Monster were in for quite a shock: The kid-friendly content was replaced by X-rated videos.

The offending material was quickly removed after Google-owned YouTube and Sesame Workshop discovered it.

In place of the pornographic content, YouTube posted a message saying the explicit material had been removed due to repeated or severe violations of our community guidelines.

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

According to a New York Post report, Sesame Street issued the following statement on their Web site in the immediate aftermath of the hack attack: We always strive to provide age-appropriate content for our viewers and hope to resolve this problem quickly.

The statement appears to have been since removed, and www.sesamestreet.org is back to normal.

One YouTube video still shows evidence of the hack, but any pornographic images are censored. The hacked site included a headline under the Sesame Street titles that read: It's where porn lives.

The hackers appear to have uploaded some kind of video game sequence to the site. The pornographic content presumably appears after the gaming video.

Alongside the infiltrated content, the user profile of the alleged hacker reads:

WHO DOESN'T LOVE PORN KIDS? RIGHT? EVERYONE LOVES IT! IM MREDXWX AND MY PARTNER MRSUICIDE[the rest of the handle is not clear] ARE HERE TO BRING YOU MANY NICE CONTENT! PLEASE DON'T LET SESAME STREET GET THIS ACCOUNT BACK KIDS...PLEASE LET ME AND [MRSUICIDER1? Unclear] HAVE IT AND WE GONNA MAKE ALL THE AMERICA HAPPY! [sic]

Watch the video here:

One of the alleged hackers, MrEdxwx, had denied any involvement via his own YouTube channel.

I did not hack Sesame Street. I am an honest YouTuber, he wrote. I work hard to make quality gameplay videos, and most important I respect the community guidelines.

His YouTube denial is here:

No one has come forward to claim the other YouTube handle implicated in the hacked video.

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