Thousands of people in central Berlin were ordered to evacuate on Thursday evening after an unexploded World War II bomb was discovered in the Spree River.
Police set up a security perimeter of 500 meters in a densely populated area in the center of the German capital.
Officers went door-to-door within the security perimeter to inform residents of the evacuation order.
Around 10,000 people were told to leave their homes, police said.