G-20 in Photos: Obama Talks, Protesters Walk

As leaders of the world's top 20 economies meet in Pittsburgh, protesters embracing everything from the environment to anarchy are massing on the streets.

42 photos
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The White House
President Barack Obama and Brazilian President Luiz Inacio Lula da Silva talk during the morning plenary session of the G-20 Pittsburgh Summit at the David L. Lawrence Convention Center in Pittsburgh, Penn., Sept. 25.
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Telemundo
President Barack Obama smiles during a news conference at the conclusion of the G-20 summit, Friday, Sept. 25.
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AP
President Barack Obama, center, waves at the end of a group photo opportunity at the G-20 summit in Pittsburgh, Friday, Sept. 25. Also pictured, left to right: Indonesia's President Susilo Bambang Yudhoyono; German Chancellor Angela Merkel; Brazil's President Luiz Inacio Lula da Silva; British Prime Minister Gordon Brown; President Obama; Turkey's Prime Minister Recep Tayyip Erdogan; China's President Hu Jintao; Indian Prime Minister Manmohan Singh.
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EFE
First Lady Michelle Obama speaks to students and the spouses of the visiting G-20 leaders at the CAPA School on Sept. 25 in Pittsburgh. President Barack Obama and heads of state from the world's leading economic powers are meeting for the second day of the G-20 summit, aimed at promoting economic growth.
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The White House
President Barack Obama and Australian Prime Minister Kevin Rudd attend the leaders' lunch during the G-20 Pittsburgh Summit at the David L. Lawrence Convention Center in Pittsburgh, Penn., Sept. 25.
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The White House
President Barack Obama talks with Chinese President Hu Jintao during the morning plenary session of the G-20 Pittsburgh Summit at the David L. Lawrence Convention Center in Pittsburgh, Penn., Sept. 25.
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SHUTTERSTOCK
President Barack Obama talks with British Prime Minister Gordon Brown and French President Nicolas Sarkozy prior to making a statement about Iran at the David L. Lawrence Convention Center in Pittsburgh, Penn., Sept. 25.
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Orange Police
Thousands of protesters march through Pittsburgh, Friday Sept. 25. World leaders are in Pittsburgh for the G-20 summit.
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The White House
President Barack Obama talks with Indian Prime Minister Dr. Manmohan Singh during a G-20 leaders working dinner at the Phipps Conservatory and Botanical Gardens in Pittsburgh, Penn.
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The White House
President Barack Obama makes remarks during the leaders' lunch at the G-20 Pittsburgh Summit at the David L. Lawrence Convention Center in Pittsburgh, Penn., Sept. 25.
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necn
President Barack Obama talks with German Chancellor Angela Merkel and Mexican President Felipe Calderon during a G-20 leaders working dinner at the Phipps Conservatory and Botanical Gardens in Pittsburgh, Penn.
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AP
Similar summits in the past, such as one in Seattle in 1999, have seen large-scale rioting and violent clashes. In Pittsburgh, cops seem determined not to let things boil over. Here, a protester is forcefully detained.
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AP
A police officer threatens to pull the pin on a tear gas canister in Pittsburgh at the G20 summit.
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AP
President Barack Obama talks with Russian President Dmitry Medvedev at the start of the G-20 summit dinner in Pittsburgh.
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NBC10
A bystander covers her face after police used chemical irritants at the University of Pittsburgh during the G20 Summit.
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AP
President Barack Obama and first lady Michelle Obama welcome France's President Nicolas Sarkozy and his wife Carla Bruni as they arrive for the G-20 summit dinner in Pittsburgh.
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AP
President Barack Obama and first lady Michelle Obama wait to receive guests at the G-20 summit dinner in Pittsburgh.
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File--AP
German Chancellor Angela Merkel is welcomed by President Barack Obama upon her arrival for the G-20 summit dinner in Pittsburgh.
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AP
Demonstrators march in the Lawrenceville section in Pittsburgh, Thursday Sept. 24 in protest of the G-20 summit.
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AP
Protesters were dispersed with tear gas on Thursday, the first day of the two-day G-20 summit.
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AP
A protester washes the eyes of a fellow protester during a demonstration after Pittsburgh cops fired pepper spray and smoke at marchers, who had been denied a permit for their rally.
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AP
Several merchants boarded up their storefronts before the summit, but some did not. Here, a window was broken by angry protesters hurling rocks.
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AP
Here, a protester runs from riot police.
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NBC Bay Area
The heavy police presence was in place well before world leaders began arriving on Thursday afternoon.
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AP
Two people are detained by riot cops after protesters overturned trash bins and threw rocks.
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AP
On every corner in downtown Pittsburgh, riot cops are at the ready.
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AP
Cops fired tear gas at protesters when they refused to disperse.
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AP
Protesters are decrying capitalism as the wealthiest nations' leaders meet.
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AP
Oxfam International activists, including one posing as President Obama stage a mock football game in Pittsburgh Steelers' colors to draw attention to global poverty issues.
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AP
Demonstrators march through the Lawrenceville section of Pittsburgh in protest of the G20 summit.
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NBC 7
An unidentified man holds an American flag upside down near a military checkpoint.
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AP
A woman holding a child makes a peace sign as protesters march past her door.
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AP
Demonstrators shouted slogans and waved signs on the first day of protests. More demonstrations were expected on Friday.
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AP
G-20 demonstrators march with a banner through Pittsburgh.
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Getty Images
A man holds his ears and ducks during clashes between protesters and police.
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AP
Stephon Boatwright of Syracuse, N.Y., wears a Guy Fawkes mask as he participates in a demonstration.
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AP
A cop stands with Army and Air Force personnel at a barricade in downtown Pittsburgh.
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AP
President Obama and wife Michelle arrive at Pittsburgh International Airport in Coraopolis, Pa., to attend the G-20 summit.
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AP
Treasury Secretary Timothy Geithner greets Japan's Finance Minister Hirohisa Fujii before a meeting onThursday.
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AP
French President Nicolas Sarkozy and his wife Carla Bruni arrive at Pittsburgh International Airport to attend the G-20 summit.
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Penny Novak
German Chancellor Angela Merkel is greeted upon her arrival for the G-20 Summit in Pittsburgh.
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AP
A man is detained by security personnel in the Shadyside of Pittsburgh. Police fired canisters of pepper spray and smoke at marchers protesting the G-20 summit.
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