Unrest in Hamburg has continued into Friday as the G20 summit has kicked off in the city. Forty-five people have been detained and 159 police officers have been wounded in clashes, according to police cited by German media. Police had to resort to water cannon to disperse protesters while earlier several cars were set on fire in the suburb of Altona. G20 protesters staged a sit-in demonstration and blocked a road in Hamburg on Friday morning. Police said that they tried to urge the protesters to disperse peacefully, but then deployed water cannon to clear the road. Hamburg police requested reinforcements following overnight clashes in the city, according to Germany’s Welt newspaper, citing police officials. Berlin and Baden-Württemberg police units deployed 200 more officers each in addition…