Twitter came under fire after several accounts belonging to critics of the Chinese government were removed from the site.

Though the site is banned in the country, many users including human rights lawyers and activists employ virtual private network software to post.

The company said the move was an accident, and pushed back against concerns that the Chinese government had successfully targeted users ahead of the 30th anniversary of the bloody June 4 crackdown on pro-democracy protests at Tiananmen Square.

Visit Business Insider's homepage for more stories.

Twitter came under fire for suspending the accounts of several Chinese-language users at a sensitive time for the country, which is at the center of tightening censorship.

The crackdown, which came overnight Friday and into Saturday, left a bad taste for many users because it came ahead of the anniversary of the bloody June 4 clash between government forces on pro-democracy protests at Beijing's Tiananmen Square.

The New York Times reported that more than 100 accounts belonging to Chinese-based activists, college students, human rights lawyers, and nationalists were affected.

Republican Sen. Marco Rubio was among users who spoke out about the suspensions, saying the company had "become a Chinese [government] censor."

However, the company pushed back on similar suggestions, saying in a statement posted to the company's Public Policy page Saturday, that though "some of these were involved in commentary about China," the deletions were part of a "routine action" that suspended "a number of accounts" in an effort to target potential "platform manipulation."

"These accounts were not mass reported by the Chinese authorities — this was a routine action on our part," the company said. "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."

Read more: China's internet censors are on high alert ahead of the anniversary of the Tiananmen Square protests

The company's explanation clarified that the action didn't originate with the Chinese government, but that didn't soothe concerns for all users. Yaxue Cao, founder and editor of ChinaChange.org, a website dedicated to writings on civil society and human rights, pointed out that the company's explanation doesn't add up to justify the suspensions.

"Per @Twitter's explanation, it's cleaning up CCP bots but accidentally suspended 1000s anti-CCP accts," Cao tweeted. "That doesn't make sense."

Though the site said users whose accounts were deleted should be able to recover them, Gab, a social network that is popular among users affiliated with the alt-right and other fringe groups, seized on the incident to promote its own commitment to open posting, tweeting Sunday that the site was "We are working on getting in touch with the Chinese dissidents who Twitter banned on behalf of the Chinese government to get them on Gab."

Widening trend of censorship ahead of Tiananmen anniversary

An Audi car drives past Tiananmen Square as a police officer stands guard on a street in central Beijing February 29, 2012. When China's leader-in-waiting Xi Jinping pulls up in a motorcade sometime in the next decade, he will probably not be riding in one of the black Audis that have become standard for Chinese top brass. China is Audi's biggest market. It is the largest German luxury marque in the country, but its government sales in China reach only into the low single-digit percentage; the bulk of its customers are companies and individuals. REUTERS/Soo Hoo Zheyang

The incident sparked concerns because of its close proximity to the 30th anniversary of the bloody June 4 crackdown on pro-democracy protests at Tiananmen Square that has been accompanied by a tightening of censorship across the country.

Twitter in particular site been long-targeted in the country, where users bypass the country-wide block with virtual-private network software. Late last year, China's Ministry of Public Security began to target Chinese Twitter users in a harsh development of President Xi Jinping's widespread campaign to suppress internet activity.

Under the order, a special police force was dedicated to finding, detaining, and interrogating users, who were then forced to delete their tweets.