Stephan Balliet is alleged to have posted an anti-Semitic screed before carrying out the Oct. 9 attack in the eastern German city of Halle. He broadcast the shooting live on a popular gaming site.

About 10,000 people participated in the march through the German capital. Several thousand others protested Saturday in other cities including Hamburg and Marburg.

The suspect published a racist and anti-Semitic manifesto and live-streamed the shooting on Wednesday.