ORLANDO, Fla. — Family members of victims who died during the Pulse nightclub attack have filed a lawsuit against Twitter, Facebook and Google, saying that the companies have provided material support to Islamic State terrorists.

Twitter, Facebook and Google — the defendants in the case — are being accused of allowing ISIS to have accounts on their sites, among other things, in the suit filed in U.S. District Court in the Eastern District of Michigan.

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"For years, Defendants have knowingly and recklessly provided the terrorist group ISIS with accounts to use its social networks as a tool for spreading extremist propaganda, raising funds, and attracting new recruits. This material support has been instrumental to the rise of ISIS and has enabled it to carry out or cause to be carried out, numerous terrorist attacks, including the June 12, 2016, attack in Orlando where 53 were injured and 49 were killed," the plaintiffs stated in the 51-page court document.

The plaintiffs stated that without the use of Twitter, Facebook and YouTube (which was bought by Google in 2006), ISIS would not have been able to grow as it did by recruiting followers.

They also claim that the companies profit from ISIS by placing ads on the terror group's social media posts.

"Videos that are approved generate revenue for both the poster and for Google. Therefore, according to its terms, if there are ads associated with a YouTube video, the video has been approved by Google, Google is earning revenue from each view of that video, and Google is sharing revenue with the poster," the lawsuit stated.

The lawsuit cites examples of the importance of social media to ISIS, such as when the terrorist group posts promotional training videos or when a Saudi Arabian suicide bomber joined ISIS in Syria and tweeted her intent to become a martyr.

And Omar Mateen, the Pulse nightclub shooter who killed 49 people and wounded dozens, posted messages on Facebook before and during the attack, such as this one: "The real Muslims will never accept the filthy ways of the west."

The lawsuit stated that ISIS has numerous accounts on the internet sites, and once one account is taken down, a new one comes up.

This station has reached out to the internet giants and is awaiting comment.

YouTube, Facebook and Twitter each have policies against people or groups posting violence or hate speech.