The protesters camped overnight wearing yellow shirts of the Bersih movement the coalition for clean and fair elections even after authorities blocked the organizer's website and banned yellow attire and the group's logo in a bid to deter the rallies, which were also held in other Malaysian cities.
Former Prime Minister Mahathir Mohamad, who has been spearheading calls for Najib's resignation, added momentum to the rally when he made a surprise brief appearance late yesterday with his wife to loud cheers from the crowd, and telling protesters to "carry on."
He slammed the protests for tarnishing Malaysia's image. "Those who wear this yellow attire ... They want to discredit our good name, scribble black coal on Malaysia's face to the outside world," Najib was quoted as saying by national news agency Bernama.
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"This is a watershed moment. Malaysians are united in their anger at the mismanagement of this country. We are saying loudly that there should be a change in the leadership," said protester Azrul Khalib, who slept on the street with his friends.
He said he was aware that the rally will not bring change overnight, but he wants to be "part of efforts to build a new Malaysia."
Some used colored chalks to scrawl their demands on the street: "We want change," and "We want clean and fair (elections)."
Support for Najib's National Front has eroded in the last two general elections. It won in 2013, but lost the popular vote for the first time to an opposition alliance.