Law enforcement officers from the National Bureau of Investigation arrested Ressa at Rappler's office in Manila on Wednesday evening, Rappler reported.
Rappler CEO and executive editor Maria Ressa talks to her lawyer shortly before her arrest on February 13, 2019.
Duterte, who has waged an anti-drug campaign that has left thousands dead, has openly criticized journalists who have covered him in an unfavorable manner.
Around 5 pm on Wednesday, NBI officers clad in civilian clothes went to the Rappler headquarters to serve the warrant of arrest.More news: Savage Released On Bond Following ICE Arrest
"We are not intimidated".
Ressa and a former Rappler researcher, Reynaldo Santos Jr., were indicted recently, the Department of Justice said.
Maria Ressa, center, stands on stage at a 2018 New Year's Eve celebration in New York's Times Square. No amount of legal cases, black propaganda, and lies can silence Filipino journalists who continue to hold the line, .
The NUJP believes that the Department of Justice twisted the law when it charged Ressa with cyberlibel, even if the story involved was published before the Cybercrime Prevention Act of 2012 (Republic Act No. 10175) was signed into law.
Ressa's arrest also threatens to increase self-censorship in the Philippines, Butler says.More news: Anthony Joshua to fight Jarrell Miller in USA on June 1
"This is brazenly politically motivated, and consistent with the authorities" threats and repeated targeting of Ressa and her team, ' it said. "This government, led by a man who has proven averse to criticism and dissent, now proves it will go to ridiculous lengths to forcibly silence a critical media and stifle free expression and thought".
The offending article appeared in Rappler in May 2012.
Ressa's arrest does not indicate suppression of the press, presidential spokesman Salvador Panelo told local media. Keng did not object to the article until 2017, after Duterte's government began accusing Rappler of running fake news and being illegally run by foreigners (the Philippines requires all national media to be owned and operated by Philippine nationals).
IPI director of advocacy Ravi R. Prasad said: 'The arrest of Maria Ressa is an outrageous attempt by the Philippines government to silence a news organization that has been courageously investigating corruption and human rights violations in the country. She was among four journalists, including the murdered Saudi columnist Jamal Khashoggi, named by Time magazineas Person of the Year for 2018.
Ressa, who has worked with CNN, also was the victor of two prestigious journalism awards past year, a Press Freedom award from the New York-based Committee to Protect Journalists, and the International Centre for Journalists' Knight International Journalism Award.More news: Morgan Stanley to buy Canadian employee stock manager for $900 mln