It is a dark day on Sesame Street. The YouTube channel for the popular children's television series was torn apart by hackers Monday, who modified the page design, deleted all of the channel's videos and replaced them with graphic hardcore pornography videos.

As of 11 a.m. EDT Monday, Sesame Street's YouTube channel was still down.

Luckily, Google was on top of it. Within 22 minutes, Google, which owns YouTube, had taken down all of the graphic content and closed the channel. Some search results on YouTube still show graphic thumbnails, but Google is doing its best to remove all of these.

YouTube representatives declined to comment on the Sesame Street incident but said the removal of content aligns with the company's 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.

The hackers also altered the Sesame Street profile page to list the name MrEdxwx as the user. The profile also included the following message:

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 Street to get this account back kids :( please... Let me and MrSuicider91 have it and we gonna make all the America happy!

A user on reddit initially suggested that MrEdxwx was behind the attack, but MrEdxwx, however, posted a video  Monday morning explaining that he did not hack Sesame Street.

I did not hack Sesame Street, MrEdxwx's message read. I am an honest YouTuber. I work hard to make quality gameplay videos, AND MOST IMPORTANT I RESPECT THE COMMUNITY GUIDELINES.

Once Google finds the source of the hack, it will find a way to plug it up as in July 2010, when Justin Bieber's YouTube videos were similarly hacked to induce adult-site redirects and crass pop-ups windows. Google discovered the issue was caused by a cross-site scripting vulnerability, which allowed the hackers to insert code into the viewer comments pages. The company fixed the issue.

YouTube is by far the most popular video site on the Internet. The site is localized in 25 countries across 43 different languages. The site enjoys over 3 billion video views daily.