Philippine journalist and Time magazine Person of the Year and Maria Ressa was freed on bail Thursday after having been detained overnight.

The chief executive officer and executive editor of news website Rappler posted bail of 100,000 pesos ($1,900) after she was accused of cyber libel for an article published in 2012 – four months before the law under which she is accused was enacted.

Rappler is critical of the government of President Rodrigo Duterte.

"The message is clear. It's an abuse of power, it's a weaponization of the law. Another line was crossed but if they wanted to scare me, this isn't the way to scare me," Ressa told reporters Thursday.

At around 5pm Wednesday, Ressa was in the Rappler newsroom when plain-clothed officers from the National Bureau of Investigation (NBI) entered to hand-deliver her arrest warrant.

Although the order was signed by a judge on Tuesday, the authorities handed the document to her late afternoon Wednesday when most of the courts were about to close, therefore reducing the likelihood of posting bail.

A judge then refused the posting of bail, forcing her to spend the night in custody.

The Department of Justice presented cyber libel charges against Rappler, Ressa as its CEO and journalist Reynaldo Santos for a story published in May 2012 on businessman Wilfredo Keng.

So far no arrest warrant has been issued against Santos, a researcher who no longer works for Rappler.

Three prosecutors from the justice department ruled last month in favor of Keng, who in Oct. 2017 filed a complaint against Rappler's story, which was based on intelligence reports and linked him to illegal drugs and human trafficking.

Keng filed his complaint five years after the story's publication to the Office of Cybercrime at the NBI, which dismissed the case in Feb. 2018 over lack of grounds and because the one-year deadline to file a libel complaint had expired.

However, the justice department reopened the case the following month based on a "continuous publication" argument as the report is still available online.

The cyber libel law under which Ressa has been charged came into force four months after the publication of the story and is not retroactive, according to her lawyer, JJ Risini.

This is not the only judicial process facing Ressa. Last November another arrest warrant was issued against her for five offenses of tax evasion, both against Rappler as a company and against her personally.

Ressa evaded prison with five bail payments - Thursday's being the sixth - and the case is awaiting trial, although the she has repeatedly denied the charges and claimed political persecution by Duterte’s administration.

Duterte has been vocal about his animosity towards Rappler, which he has accused of being financed by the United States' Central Intelligence Agency, and in Feb. 2018 banned Rappler reporters from the presidential palace.

The Committee to Protect Journalists' board chair Kathleen Carroll said Wednesday that "the arrest of Maria Ressa is an outrage," adding that "she should be freed immediately and the Philippines government needs to cease its multi-pronged attack on Rappler, its talented leader, and its brave staff."

Human Rights Watch said “the Duterte administration’s attacks on such a globally prominent news outlet demand a global response.”