She faces up to five years in prison if found guilty of the charge, according to Belarusian law.
Kolesnikova has engaged in “calls for action aimed at endangering the national security of the Republic of Belarus,” the Committee of Inquiry said in a statement posted on the Telegram network.
“She remains in custody. An investigation is ongoing,” the statement said.
Kolesnikova is a close ally of Belarusian opposition leader Svetlana Tihanovskaia, who fled to Lithuania last month amid violent repression of opposition protests.
Tihanovskaya pledged in an interview published Tuesday night to reassure President Alexander Lukashenko if he resigns and retires peacefully.
Maria Kolesnikova accuses Securitate (KGB) agents of forcibly punching her in the head and threatening to execute her while trying to expel her from Belarusian territory in Ukraine, Reuters reports.
“He told me expressly that if I did not leave Belarus voluntarily, I would be expelled anyway, alive or in pieces,” she writes.
“I was also threatened with imprisonment (for a period of) of 25 years,” Kolesnikova said.
This statement was broadcast by the Belarusian news site tut.by, which quotes the opposition’s lawyer.
A representative of the Belarusian opposition and the unprecedented challenge of announcing the re-election of President Alexander Lukashenko on August 9, Maria Kolesnikova was abducted on Monday by men wearing masks.
She tore her passport to avoid being forcibly deported to Ukraine, Ukrainian news agency Interfax Ukraine revealed on Tuesday.
His lawyer announced on Thursday that the opponent wants to sue the authorities, especially the Belarusian Security (KGB), because of the treatment he subjected her to.
Another opponent, Maxim Znak, was also arrested. Supporters say he was abducted on Wednesday by masked men in civilian clothes.
The Belarusian National Commission of Inquiry has confirmed the detainees of the two and said they are accused of violating state security.
Svetlana Tihanovskaia, the candidate defeated in the August 9th presidential election, fled to Lithuania in the early days of the Belarus protest.
There have been daily protests in Belarus since the August 9th presidential election. Last weekend, at least 100,000 people gathered for a protest march in Minsk.