A Holocaust denier from Canada has been arrested in Germany and is under investigation for crimes related to incitement of hate, a spokesperson for the Bavarian State Public Prosecutor in Munich confirmed to JTA.

News of the arrest of Monika Schaefer first broke in the Canada-based online news agency Fitzhugh. Schaefer is known for posting a YouTube video in 2016 in which she called the Holocaust the most “persistent lie in all of history.”

Though prohibited by German law from revealing the name of a suspect under investigation, spokesperson Andrea Mayer confirmed that a woman fitting her description had been recognized in the public audience at a trial in Munich of another person charged with incitement to hate, Sylvia Stolz, a former lawyer in Germany who already has been convicted of Holocaust denial. Stolz represented Holocaust denier Ernst Zundel, who died in 2017.

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Acting on a tip, police arrested the Canadian woman and are holding her in custody during an investigation of charges based on her dissemination of hate materials via the internet.