Rigaer Straße is a street in Friedrichshain, Berlin that runs from Bersarinplatz in the west to the railway station Frankfurter Allee in the east. The street is named after the Latvian capital Riga. From Wikipedia
A group of 20 masked individuals targeted police with pyrotechnics and injured a resident after he alerted authorities to suspicious activity in Friedrichshain late Friday night.