Authorities in Hong Kong are bracing for large scale protests similar to those at recent annual summits of the World Trade Organization.

Protesters raise anti-WTO banners during a protest as thousands of anti-globalization activists march

On Sunday, about 4,000 anti-globalization activists marched without major incident through the streets of Hong Kong. The march had a carnival atmosphere. Demonstrators say their numbers will increase when the summit convenes on Tuesday. City officials have taken steps to prevent the protests from becoming violent.

Sunday's march was the first of three large demonstrations planned for the summit. Another will be held Tuesday, and the final protest rally is scheduled for the closing day next Sunday.

Violent protests marred previous trade meetings in Cancun and Seattle. Thousands of police have been put on alert for the Hong Kong summit.