Police said riots were extremely aggressive in the early hours of Saturday in the city's Schanzenviertel neighbourhood, which is only a few hundred meters (yards) away from the summit grounds.
Many will want to know how Merkel cleverly brought back Russia into the fold of World Leaders. Smoke bombs detonated in the crowd.
However, it seems Melania was given the all clear - given her calm and composed appearance in Hamburg this evening.
He said it was the first duty of governments to keep their citizens safe.
Environmentalists want the G20 to increase their climate commitments over this weekend.
Protests were expected to continue Friday and Saturday, stoked by the presence of divisive foreign leaders, including Putin and Erdogan.
Hamburg, Germany's second-largest city, has a strong radical left scene. 'I understand why he has to do this-to prove he's a man, ' she told a group of reporters.
"We underline our resolve to make the international financial system entirely hostile to terrorist financing and commit to deepening international cooperation and exchange of information", the statement said.
German Chancellor Angela Merkel is battling to prevent US President Donald Trump undermining the world leaders' united front on climate change. But a few thousand rioters, some of them from elsewhere in Europe, created havoc in the city.
Putin spoke after a meeting with the leaders of China, India, Brazil and South Africa.
Police arrested 143 people, and 122 activists were temporarily detained. Protesters persisted in their attempt to seize intersections and other public spaces after beginning the day by trying to penetrate a broad police cordon clearing traffic along routes linking the summit venue to the airport and hotels.
Putin y Trump se encuentran por primera vez cara a cara
Trump y Putin se reunieron durante la ronda inicial de reuniones bilaterales de la Cumbre que comenzó hoy en Hamburgo , Alemania .
Later, special units raided a culture centre that's known to be a meeting point for violent protesters.
Police, who say protesters touched off the violence that began on Thursday by hurling rocks at officers, responded with pepper spray and water cannons. "We think that's politically and substantially wrong". Saudi Arabia's King Salman isn't attending, and his country is represented by Ibrahim al-Assaf, the minister of state.
German Chancellor Angela Merkel has told Group of 20 leaders that millions of people are hoping that they can help solve the world's problems.
"There was nothing until 9 p.m. when we closed, then it got so bad". In fact, despite having both grown up in communist regimes, Merkel and Putin are said to have a relationship that some describe as complex and grudging.
Canada committed $20 million and the United States $50 million to the Women Entrepreneurs Finance Initiative.
Police made some arrests but said Thursday evening they did not have a final tally. "I'm not staying here another night".
Protesters set fires to bins and debris.
But the Hamburg protests have gained added momentum as a stand against Trump and his brand of "America First" populism.
Activists from the environmental Greenpeace group scaled a bridge and unfurled a banner saying, "G-20: End Coal".
Fighting global warming is one of the major issues on the G-20 agenda, but negotiations are proving to be difficult since the U.S. left the international Paris climate agreement a few weeks ago.
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