 Since 4pm , at least 200 people also blocked the Berliner Platz, the most important inner city crossing, bringing most of the downtown bus and car traffic to a standstill.
<clarity>  Since 4pm , at least 200 people also blocked the Berliner Platz, the most important inner city crossing, bringing most of the downtown bus and car traffic to a standstill.
 From 4 to 7pm , at least 200 people also blocked the Berliner Platz, the most important inner city crossing, bringing most of the downtown bus and car traffic to a standstill.