International

A shop owner told Blick a man was spotted roaming the streets with a chanisaw, but this is yet to be confirmed.

Among the injured to said to be an elderly man who suffered head wounds.

Police and ambulances are on the scene and rescue helicopters are circling overhead.

The street in the city's old town has been sealed off and terrified shoppers have sought refuge in businesses.

The incident has been described as a "special situation" by officers. The incident comes on the day UK Prime Minister Theresa May embarked on a three-week holiday to Switzerland.