A human rights activist in Belarus on Thursday began a hunger strike inside prison in the latest protest against the repressive government of Alexander Lukashenko, a rights organization said.

The Belarusian human rights organization Viasna said Aliaksandar Vaitseshyk went on hunger strike in the city of Baranavichy, in western Belarus, after being sentenced to 15 days of administrative arrest.

He was convicted on charges of "distributing extremist materials," a charge which Belarus authorities have frequently used to detain activists in recent years.

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Belarus was rocked by mass protests during Alexander Lukashenko’s disputed election in 2020, which the opposition and the West condemned as fraudulent. Since then Belarusian authorities have detained more than 35,000 people, many of whom have reportedly been tortured while in custody.

Vaitseshyk was detained on Nov. 9 by armed men near his home on the same day 10 opposition activists were also detained, Viasna said. During a search of his home, Vaitseshyk’s laptop and phone were confiscated.

On Thursday, another human rights activist was also detained in the southern city of Mozyr. According to Viasna, Uladzimir Tselyapun was on his way to file a complaint with the city government but was arrested before arriving. He is currently being held in a temporary detention center Viasna said.

There are 1,450 political prisoners currently behind bars in Belarus, including Nobel Peace Prize Laureate and human rights activist Ales Bialiatski.