The German Federal Office for the Protection of the Constitution, Germany's internal security agency, is preparing to deal with the expected 10,000 violent left-wing extremists in the upcoming G20 summit in Hamburg. According to a report published in the German newspaper Die Welt, many protestors are also expected to arrive from other European countries.

The heads of state and governments of the world's 20 leading industrial and emerging countries will meet in Hamburg on and July 7 and 8. The summit focuses on questions of global economic, commercial and developmental policy.

The report also says that the agency is mobilizing more resources than it had 10 years ago for the G20 in Heligendamm, population 3,000, which also faced similar extremist problems. The agency is regarding this year's threat as extremely serious, particularly because of the difficult and complicated situation in the city center of Hamburg, home to nearly 2 million.

According to Die Welt, a special evaluation, codenamed "Störtebeker", the agency has been monitoring activities of left-wing extremists for several months now. By the order of Hans-Georg Maaßen, the agency's president, Störtebeker has become its own working group, and has nearly become its own special organization with more specified purposes.

The agency's report also says that extremists from not only Hamburg, but also Göttingen and Freiburg will participate in the protest. The agency is also worried about security concerns not just in Hamburg but throughout the entire German federal territory.

In addition to left-wing extremists, who are predicted to make up the majority of the protest body, supporters and opponents alike of world leaders such as US President Donald J. Trump, Russian President Vladimir Putin and Turkish President Recep Tayyip Erdoğan are also expected to be present, which is worrying the agency as they fear the different groups might even start fights amongst themselves.