Hillary supporters have been accused of overloading pro-Bernie Sanders Facebook pages with porn.

Cyberattackers are believed to have flooded social media accounts such as Bernie or Bust, Bernie Believers and Bernie Sanders is my HERO with x-rated images in a coordinated attack.

The groups were then flagged for obscene content and then taken down.

However a thread on Reddit with a screenshot of a message sent by Sanders' social media manager Aidan King seemed to suggest the pages were deleted because of a bug.

Hillary supporters have been accused of overloading pro-Bernie Sanders Facebook pages with porn. Cyberattackers are believed to have flooded social media accounts such as Bernie or Bust, Bernie Believers and Bernie Sanders is my HERO with x-rated images in a coordinated attack

A Facebook spokesman told Daily Mail Online: 'A number of groups were inaccessible for a brief period after one of our automated policies was applied incorrectly. We corrected the problem within hours and are working to improve our tools.'

Erica Libenow, a member of a Bernie group, told Heavy.com: 'We had what looked like a kiddie porn posted in one of our groups today. I reported that one. Seriously made me want to vomit.'

According to The Hill, the trolling started at 9pm on Monday and ended at midnight.

The groups, some of which have more than 50,000 members, were eventually put back online.

Admins of the group removed the troll posters and all the pornographic-related posts.

One of those who allegedly uploaded obscene content was a member of Bros4Hillary, Casey Champagne.

One of those who allegedly uploaded obscene content was a member of Bros4Hillary, Casey Champagne

He posted a screenshot after he was informed he had been removed from a group.

According to the Daily Beast, a pro-Hillary Clinton Super PAC has planned to spend $1 million to 'push back against' users on Twitter, Facebook, Reddit and Instagram.

He posted a screenshot after he was informed he had been removed from a group

Barrier Breakers have said they will share positive content and 'push back' against opponents.

There’s no proof of any connection between that PAC and this attack.

Bros4Hillary political director Alex Mohajer released a statement saying: 'Bros4Hillary (B4H) was created as a way to provide a positive and supportive community for supporters of Hillary Clinton to gather, and as a direct response to the hateful and divisive rhetoric used by other campaigns during this election cycle.

'Our mission statement is about inclusiveness and tolerance, and we pride ourselves on our diverse membership and the unity through diversity we aim to achieve.

'We have not and do not approve of or condone harmful or offensive rhetoric or harassing behavior targeting supporters of any other candidate in the race.

'We have repeatedly and officially condemned such words and behaviors.

'Last night, a former member by the name of Casey Champagne decided to engage in harassing behavior toward Facebook groups of Bernie Sanders and posted about it in the B4H Facebook group.

'As stated above, this was not promoted or supported by the leadership of B4H, nor were we immediately aware of this conduct.

'We removed the offending posts and member as soon as possible. While our leadership team of administrators tries to catch every questionable post and comment, with over 7,000 members and on a 24-hour posting cycle, some fall through the cracks.

'We rely on members to “flag and report” harmful, offensive, or trolling behavior, and apologize to the groups that were affected. This member acted on his own authority, is not a part of our leadership team, and does not represent our ideals or our opinions.'

One Twitter user listed some of the groups who had been targeted, but Facebook insisted it was a glitch