German police disperse G-20 protest with water cannon before summit

HAMBURG (Reuters) - German police used water cannons to disperse around 500 anti-capitalist protesters overnight in the port city of Hamburg where Chancellor Angela Merkel will host leaders of the G-20 leading economies in a two-day summit starting on Friday.

Tens of thousands of protesters are expected to march in the city this week against globalization and what they say is corporate greed and a failure to tackle climate change. German authorities believe around 8,000 demonstrators were prepared to use violence, the interior minister said on Tuesday. Some 20,000 police officers will be deployed.

Photos from the scene:

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Protests erupt at G-20
HAMBURG, GERMANY - JULY 06: Police use water cannons and peper spray against demonstrators at Hamburg harbor attending the �elcome to Hell�anti-G20 protest march on July 6, 2017 in Hamburg, Germany. Leaders of the G20 group of nations are arriving in Hamburg today for the July 7-8 economic summit and authorities are bracing for large-scale and disruptive protest efforts. (Photo by Thomas Lohnes/Getty Images)
Police use water cannon torwards a protester with a red flag during the 'Welcome to Hell' rally against the G20 summit in Hamburg, northern Germany on July 6, 2017. Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / John MACDOUGALL (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)
HAMBURG, GERMANY - JULY 06: Police use water cannon against demonstrators at Hamburg harbor attending the �elcome to Hell�anti-G20 protest march on July 6, 2017 in Hamburg, Germany. Leaders of the G20 group of nations are arriving in Hamburg today for the July 7-8 economic summit and authorities are bracing for large-scale and disruptive protest efforts. (Photo by Thomas Lohnes/Getty Images)
HAMBURG, GERMANY - JULY 06: Police use water cannons and peper spray against demonstrators at Hamburg harbor attending the �elcome to Hell�anti-G20 protest march on July 6, 2017 in Hamburg, Germany. Leaders of the G20 group of nations are arriving in Hamburg today for the July 7-8 economic summit and authorities are bracing for large-scale and disruptive protest efforts. (Photo by Thomas Lohnes/Getty Images)
HAMBURG, GERMANY - JULY 06: A woman looks at a man's eye after he was allegedly punched by a police man during the 'Welcome to Hell' protest march on July 6, 2017 in Hamburg, Germany. Leaders of the G20 group of nations are arriving in Hamburg today for the July 7-8 economic summit and authorities are bracing for large-scale and disruptive protest efforts tonight at the 'Welcome to Hell' anti-G20 protest. (Photo by Leon Neal/Getty Images)
HAMBURG, GERMANY - JULY 06: Police use water cannon against demonstrators at Hamburg harbor attending the �elcome to Hell�anti-G20 protest march on July 6, 2017 in Hamburg, Germany. Leaders of the G20 group of nations are arriving in Hamburg today for the July 7-8 economic summit and authorities are bracing for large-scale and disruptive protest efforts. (Photo by Thomas Lohnes/Getty Images)
HAMBURG, GERMANY - JULY 06: People carrying flowers and wearing cycling helmets look at the riot police during the 'Welcome to Hell' protest march on July 6, 2017 in Hamburg, Germany. Leaders of the G20 group of nations are arriving in Hamburg today for the July 7-8 economic summit and authorities are bracing for large-scale and disruptive protest efforts tonight at the 'Welcome to Hell' anti-G20 protest. (Photo by Leon Neal/Getty Images)
Riot police block protesters during the 'Welcome to Hell' rally against the G20 summit in Hamburg, northern Germany on July 6, 2017. Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / John MACDOUGALL (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)
A can is thrown as riot police use water cannon during the 'Welcome to Hell' rally against the G20 summit in Hamburg, northern Germany on July 6, 2017. Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / John MACDOUGALL (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)
HAMBURG, GERMANY - JULY 06: Riot police stand guard during the 'Welcome to Hell' protest march on July 6, 2017 in Hamburg, Germany. Leaders of the G20 group of nations are arriving in Hamburg today for the July 7-8 economic summit and authorities are bracing for large-scale and disruptive protest efforts tonight at the 'Welcome to Hell' anti-G20 protest. (Photo by Alexander Koerner/Getty Images)
Riot police use water cannon during during the 'Welcome to Hell' rally against the G20 summit in Hamburg, northern Germany on July 6, 2017. Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / STEFFI LOOS (Photo credit should read STEFFI LOOS/AFP/Getty Images)
Riot police use pepper spray during the 'Welcome to Hell' rally against the G20 summit in Hamburg, northern Germany on July 6, 2017. Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / Odd ANDERSEN (Photo credit should read ODD ANDERSEN/AFP/Getty Images)
Police use water cannon torwards a protester with a red flag during the 'Welcome to Hell' rally against the G20 summit in Hamburg, northern Germany on July 6, 2017. Leaders of the world's top economies will gather from July 7 to 8, 2017 in Germany for likely the stormiest G20 summit in years, with disagreements ranging from wars to climate change and global trade. / AFP PHOTO / John MACDOUGALL (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)
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Hundreds of mainly young left-wing activists gathered and marched on a main street shortly before midnight on Tuesday in the first major protest ahead of the summit, which will be attended by U.S. President Donald Trump, Russian President Vladimir Putin and Turkish President Tayyip Erdogan.

Der Spiegel magazine reported that the Germany army fears protesters will use unarmed drones and that it has deployed a radar to locate any possible aerial intrusions.

A spokesman for the German military declined to confirm the report.

(Reporting by Chris Stern and Hannibal Hanschke; Writing by Joseph Nasr; Editing by Raissa Kasolowsky)

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