Twitter apologized Saturday after suspending accounts critical of Chinese government days before the 30th anniversary of the Tiananmen Square protests.

The accounts were among millions suspended as part of Twitter's efforts to "protect the health of the public conversation," the company said in a statement, adding that "platform manipulation," including spam, was targeted.

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"Sometimes our routine actions catch false positives or we make errors. We apologize. We're working today to ensure we overturn any errors but that we remain vigilant in enforcing our rules for those who violate them," Twitter said

Sen. Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP MORE (R-Fla.) called Twitter out on its own platform, saying the social media outlet has become "a Chinese govt censor."

.@twitter has apparently suspended a large number accounts that are critical of #China including accounts of people outside of China. Twitter has become a Chinese govt censor. https://t.co/TsDQZs7juq — Marco Rubio (@marcorubio) June 1, 2019

June 4 will mark the 30th anniversary of the Tiananmen Square protests, when students and workers occupied the Beijing square in a pro-democracy protest. Many demonstrators were killed by communist authorities.

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Discussions of the protest are taboo in China, but Defense Minister Wei Fenghe recently defended Beijing's actions and said at a regional forum that stopping to "political turbulence" was the "correct policy," the BBC reports.