Protesters against capitalism took to the streets in Hamburg on Thursday to protest the upcoming G20 summit, during which they clashed with the German police. The police responded with water cannon, pepperball spray and baton.

Thousands of people took part in the protest against the summit attended by leaders of 20 economies. The summit will be held on Friday and Saturday.

President Trump met with German Chancellor Angela Merkel on Thursday afternoon. During this period, thousands of people gathered in the historic Hamburg fish market to confront the police. Some people throw bottles. The police responded with water cannon, pepperball spray and baton.

The video shows that masked protesters blocked the streets with building materials and set fire on a small scale. Local media reported that some properties were damaged, including cars burned. The police responded with water cannon, pepperball spray and baton.

The Hamburg police Twitter also said that the protesters threw "bottles and objects" at the police.

At least one person was reportedly injured. People can also see medical emergency workers assisting others at the side of the protest procession.

It is expected that more than 100000 protesters will be attracted during the summit. According to the police, about 8000 of them are regarded as frequent visitors to left-wing violence in Europe.

Hamburg is a port city in northern Germany. The authorities have increased the police force from all over the country, with 20000 policemen patrolling the streets, sky and waterways of Hamburg. The police responded with water cannon, pepperball spray and baton.

After Poland received a warm welcome, President Trump set foot on a less friendly land, waiting for his trade, climate and other problems. He will also meet face to face with Russian President Putin for the first time.

The protesters have already encamped and waited for the American leader.

Protester Alma Wonder said: "Donald Trump is really symbolic in how to manage the global crisis. He is a symbol of our enemy."

Hamburg has always been the center of left-wing anti-capitalist protests. German Chancellor Angela Merkel also wants to show this symbol of openness when she strongly opposes protectionism. The police responded with water cannon, pepperball spray and baton.

At a press conference before Trump's arrival, she said: "I think we are united. We are all willing to strengthen multilateral relations at the G-20 Summit. We both believe that we need an open society, especially an open trade flow.