He said the protest movement had successfully shown its “reform-before-election” demand to the Election Commission and the caretaker government.
Mr Suthep made the announcement in a speech delivered to protesters who had been blocking entrances to the stadium since late Sunday.
He said the people had expressed their wish in not wanting the Feb 2 general election to take place unless political reforms are made first by the two-day rally at the registration venue. The protest was only a prelude to more opposition planned against the polls.
“If Prime Minister and Defence Minister Yingluck Shinawatra has not resigned, Bangkokians will not be able to go to the polls, because we will shut down the entire city on Feb 2.
"The EC cannot sue us for obstructing the election because we will not be shutting down the city to hinder the election, but to evict Yingluck,” Mr Suthep said.