KYIV, Ukraine (AP) A leading opposition activist in Belarus and two other members of an opposition council went missing Monday, raising fears they were detained as authorities seek to squelch nearly a month of protests against the re-election of the countrys authoritarian leader.

Maria Kolesnikova, a member of the Coordination Council created by the opposition to facilitate talks with President Alexander Lukashenko on a transition of power, was reportedly put on a minibus in the capital, Minsk, and driven away by unidentified people. Last week, Kolesnikova announced the creation of a new opposition party.

Her disappearance follows a massive rally Sunday in Minsk that drew an estimated 100,000 protesters demanding the resignation of Lukashenko, who extended his 26-year rule in an Aug. 9 election that the opposition and some poll workers say was rigged.

Sundays demonstrations in Minsk and other cities went on despite authorities warning that participants could face reprisals. The Interior Ministry said 633 people were detained Sunday for taking part in unsanctioned protests.

Council member Maxim Znak said Kolesnikovas colleagues fear she was detained and two other council members also couldnt be reached Monday.

The Belarusian Interior Ministry said it hasnt detained Kolesnikova but the State Security Committee that still goes under the Soviet-era name KGB has kept mum.

The Coordination Council denounced what it described as methods of terror used by the government instead of a dialogue with society.

Such methods are unlawful and will only exacerbate the situation in the country, deepen the crisis and fuel more protests, it said in a statement.