KYIV, Ukraine (AP) — Tens of thousands of protesters in Belarus swarmed the streets of the capital Sunday, pressing for the resignation of the country’s authoritarian leader in what human rights activists described as the largest anti-government rally since late August.

Over 200,000 people took part in the demonstration in Minsk, the Viasna human rights center said. They carried red and white flags and marched while chanting “Go away!” and “New election!,” references to a disputed presidential vote that returned President Alexander Lukashenko to a sixth term and triggered almost daily protests.

Several subway stations were closed, mobile internet was not working, and water cannons and armored vehicles were seen in the center of Minsk. Rallies also took place in other cities in Belarus, and police detained scores of people across the country. A list of detained protesters released by the Viasna center had over 130 names by Sunday evening.

Mass protests have rocked Belarus for over two months, ever since the official results of the Aug. 9 election gave Lukashenko a landslide victory with 80% of the vote. His main challenger, Sviatlana Tsikhanouskaya, got only 10% of the votes and refused the recognize the outcome as valid, saying it was manipulated.