Police Constable Rob McDonald said several dozen people were taken into custody at a University of Toronto building for allegedly wielding "street-type weaponry" that included bricks, bats, sharpened sticks and bottles of fluid -- "items you don't need for a weekend in Toronto," The Globe and Mail reported. No guns or knives were found, he said.
Canadian TV network CTV reported police fired rubber pellets and blank rifle shots to push back about 100 demonstrators during what apparently had been a peaceful sit-in outside a detention center.
The network said the group was chanting "peaceful protest, peaceful protest" when police moved into the crowd to grab a known anarchist. That triggered a reaction from the group, prompting the police response and more arrests.
On Saturday, an apparent breakaway group of about 70 protesters set fire to police cars, hurled bricks, and smashed store and office windows, the Toronto Star reported.
The protests, which drew thousands of demonstrators to the economic summit, halted downtown subway service much of Saturday and forced the closing of some hospitals and businesses as police corralled demonstrators by the busloads.
Officers, some pelted with bricks or other projectiles, fired tear gas for the first time in Toronto's history at Queen and Peter streets, Toronto Police Chief Bill Blair said. "We have never seen that level of wanton criminality and destruction on our streets," Blair said.
Some protest organizers told the newspaper police had intimidated and arrested peaceful demonstrators.
The Guardian confirmed Jesse Rosenfeld, a Canadian journalist freelancing for the British newspaper, was arrested during the protests Saturday night.
Steve Paikin, host of public station TVOntario's "The Agenda," witnessed the arrest and tweeted that he saw Rosenfeld, 26, being held by two officers while another punched him and drove an elbow into the man's back. Paikin called it "totally unnecessary" use of force and "police brutality."
An agreement signed in California by Cisco and Russian officials puts Russia on course to develop its own Silicon Valley in Skolkovo, near Moscow, the San Jose Mercury News reported.
"Simply put, we're all in," Cisco Chief Executive Officer John Chambers told Medvedev regarding what is intended to be a "wide-ranging series of collaborative initiatives."
California Gov. Arnold Schwarzenegger also was on hand when Cisco demonstrated its video conferencing, business social networking and sports casting technology for the Russian leader.
Cisco will initially pump in $100 million in venture money in Russia. Other facets will include establishing an innovation and venture center in Skolkovo, where Cisco also will put a second global headquarters for its Emerging Technology Group.
Cisco also will put up $175,000 in prize money for winning entrepreneurial teams in Russia.
Medvedev was to tour Apple, Google and Twitter, and speak at Stanford University later in the day.
Medvedev has made high-tech development and research top priorities of his economic agenda and is using his five-day U.S. trip to learn more about the sector, Russian news agency RIA Novosti reported Tuesday.
"There will be a serious program tomorrow: I will inspect the high-tech companies in Silicon Valley. This is very useful for us given our plans for a similar center near Moscow," Medvedev said at a dinner Tuesday in San Francisco with Schwarzenegger.
Russia is building a high-tech research hub in Skolkovo, a Moscow suburb, dubbed Russia's Silicon Valley, RIA Novosti said.
Medvedev said it would benefit Russia and the United States to cooperate in the high-tech arena and that he supports creating a Russian-U.S. working group for that purpose.
"We know you are very interested not only in developing and diversifying the economy but also you are very interested in nuclear disarmament," Schwarzenegger told Medvedev. "I want to tell you how much I appreciate that."
Schwarzenegger and Medvedev also toasted an international partnership to help California's state parks Tuesday, the San Francisco Chronicle reported. Medvedev witnessed Schwarzenegger signing a memorandum of understanding with Russia's Renova Group of Companies that will help preserve California's Fort Ross State Historic Park, a Russian-American settlement dating from the 1800s.
"Russian private investment will help the state," Schwarzenegger said. "It's a great collaboration."