Seventy-six police officers have been injured in clashes with protesters in Germany's city of Hamburg, where a G20 summit starts shortly. <br/><br/>Police said, three officers were taken to hospital. There were also reports of injuries among protesters. <br/><br/>The clashes began when police charged at masked protesters at a "Welcome to hell" march attended by 12,000 people. World leaders – including US President Donald Trump – will discuss climate change, trade and other major issues. <br/><br/>Police fired water cannon and pepper spray at masked protesters, who hurled bottles, stones and flares. Organisers cancelled the march where the first clashes took place, but protesters remained on the streets and police said violence spread to other areas of the city. <br/><br/>Medics were seen treating several people.