WASHINGTON - The U.S. foiled a plot to bomb the New York Stock Exchange because of the sweeping surveillance programs at the heart of a debate over national security and personal privacy, officials said Tuesday at a rare open hearing on intelligence led by lawmakers sympathetic to the spying.

The House Intelligence Committee hearing provided a venue for officials to defend the once-secret programs and did little probing of claims that the collection of people's phone records and Internet usage has disrupted dozens of terrorist plots.

Few details were volunteered.

SAO PAULO - Tens of thousands of Brazilians again flooded the streets of the country's biggest city to raise a collective cry against a longstanding lament - people are weighed down by high taxes and high prices but get low-quality public services and a system of government infected with corruption.

While mostly peaceful, the demonstration followed the rhythm of protests that drew 240,000 people across Brazil the previous night, with small bands of radicals splitting off to fight with police and break into stores.

Mass protests have been mushrooming across Brazil since demonstrations called last week by a group angry over the high cost of a woeful public transport system and a recent 10-cent hike in bus and subway fares in Sao Paulo, Rio and elsewhere.