Story highlights Saudi authorities accuse Samar Badawi of running her ex-husband's Twitter account, an activist says

Her ex-spouse and brother -- who are also activists -- are both currently in prison

(CNN) Samar Badawi, a notable human rights activist in Saudi Arabia, was arrested on Tuesday, according to Amnesty International.

Ensaf Haidar, president of the Raif Badawi Foundation, confirmed her arrest to CNN.

Haidar said Badawi is charged with running the Twitter account of Waleed Abu al-Khair, a prominent human rights lawyer and her former spouse.

Al-Khair is serving a 15-year prison sentence, which Amnesty International says is "in connection with his work protecting and defending human rights in Saudi Arabia."

His Twitter account has been used recently as a platform for those campaigning for his release.