"The detonator has been blown off in a controlled explosion", said Berlin police on Twitter, adding "#Goodjob guys".
The 800-metre (2,625 ft) exclusion zone "includes Berlin Hauptbahnhof, the city's main train station, as well as the German finance and transport ministries, foreign embassies, and a museum", says The Independent. The disruption lasted from 9am to 1.30pm local time.
Police said the 500kg (1,100lb) bomb, believed to have been made in the United Kingdom, posed no immediate danger but the operation was expected to cause transport chaos in the German capital.More news: FAA orders engine inspections after deadly Southwest Airlines incident
In May, more than 50,000 people were evacuated from Hanover after a bomb was discovered during pre-construction work on a site in the Vahrenwald district.
Rail traffic is tentatively planned to resume at about 1 p.m. but it's not clear yet how long the bomb disposal operation will take.
However, they added there was no immediate danger because of the bomb.More news: Key equity indices end in green on European cues (Second Lead)
Past year some 60,000 people were evacuated from their homes in Frankfurt after a massive bomb dropped by Britain's Royal Air Force was unearthed.
Flights to and from Tegel airport - about 7km away - were not affected by the evacuation.
Thousands of people around Berlin's central railway station were evacuated on Friday to allow disposal experts to defuse an unexploded World War II bomb unearthed on a building site.More news: United Nations security team came under fire in Syria's Douma
In one of the more sensational finds, a 250-kilogram (550-pound) British bomb was found in 2002 beneath the lower ring of seats during renovation work at Berlin's Olympic Stadium, where tens of thousands of fans regularly watch the city's Hertha BSC soccer club play its home games.
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