At least 130 police officers have been injured when riots broke out outside the G20 summit in Hamburg, Germany, attended by President Donald Trump, Russian President Vladimir Putin, and others. Melania Trump has been ordered to stay in her guest residence because police can not guarantee her safety.

About 8,000 demonstrators took part in their “Welcome to Hell” protest on Thursday, where 20,000 uniformed police were deployed to quell any leftist violence. 12 of the 130 injured were hurt so gravely they are not able to return to duty, the Daily Caller is reporting.

Water cannons and smoke bombs were deployed to stop the chaos, but to little avail.

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The largest demonstration is expected on Saturday, where conditions are likely to deteriorate even further. Police are warning citizens of a “life-threatening situation,” and said First Lady Melania Trump will not be allowed to participate in the program because they can not guarantee her safety. There are an expected 100,000 protesters expected on Saturday.

“There are alarming signals. The situation escalates. The police must defend the fundamental rights,” Benjamin Jendro, a spokesman for the police union in Berlin, told Welt after announcing reinforcements. “Now these fundamental rights are stamped on by violent people. This is not just the police. But the whole society.” Here’s a video feed from the site of the riots:

There were at least 500 masked demonstrators mobilizing outside the hotel where Rex Tillerson, Secretary of State is staying during the summit. In addition to the violence, protesters are forming human shields to block world leaders’ from getting to the summit.