Facebook has apologized after Prager University (PragerU), a conservative educational site, said some of its content had been removed on the social media platform.

“We mistakenly removed these videos and have restored them because they don’t break our standards,” Facebook tweeted out on Friday evening.

“This will reverse any reduction in content distribution you’ve experienced. We’re very sorry and are continuing to look into what happened with your Page,” the site added.

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We mistakenly removed these videos and have restored them because they don't break our standards. This will reverse any reduction in content distribution you’ve experienced. We’re very sorry and are continuing to look into what happened with your Page. — Facebook (@facebook) August 17, 2018

PragerU had tweeted earlier that Facebook had blocked its last nine posts from reaching its followers.

In addition, the group said that at least two videos were deleted for “hate speech.”

BREAKING: We're being heavily censored on @Facebook.



Our last 9 posts are reaching 0 of our 3 million followers. At least two videos were deleted last night for “hate speech” including our recent video with @conservmillen.



SHARE to spread awareness about big tech censorship! pic.twitter.com/k83HqmlMRc — PragerU (@prageru) August 17, 2018

The videos covered topics like the case for Israel’s right to exist, political bias in Hollywood and why young Americans view their country the way that they do.

Among the videos censored was one by The Wall Street Journal’s Potomac Watch columnist Kimberley Strassel, who accused Facebook of censorship.

PragerU has clashed with tech companies before over alleged censorship. The company filed a lawsuit last October against YouTube, arguing that the company had made its videos age-restricted because of political bias.

Some of the videos restricted to older ages included “Is Islam a religion of peace?” and “The most important question about abortion.”

The suit was dismissed in March.