Around 60,000 people were ordered to leave in what was Germany's biggest evacuation since the war, with more than a thousand emergency service workers helping to clear the area.
Residents in two German cities are evacuating their homes as authorities prepare to dispose of World War II-era bombs found during construction work this week.
Around 60,000 people have been forced to leave their homes, and Frankfurt fire and police chiefs have warned than an uncontrolled explosion could be large enough to flatten a city block.
The device was found last week in the city's leafy Westend neighborhood, home to many wealthy bankers.
The evacuation area includes Germany's central bank which houses half the country's gold reserves.
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He is survived by his adult son and daughter and his wife, Cheryl, who told him not to go into work in the heavy rains. Perez lost his life because he tried to make it happen, he tried to get at his post ..." Acevedo said .
Bomb disposal experts will use a special system to try to unscrew the bomb's fuse from a safe distance.
The British bomb is a 1.4 ton HC 4000 air mine, according to the statement. Allied forces carried out a heavy bombing campaign, and between 10 per cent and 30 per cent of the bombs that were dropped did not explode. Officials said it would take four hours to disarm the bomb.
Some 2,000 tonnes of undetonated explosives continue to be located every year in Germany, more than 70 years after the end of World War II.
Hospital patients and the elderly are among those affected in what will be Germany's biggest evacuation in recent history.
Some of the city's museums have offered free entry to displaced residents.
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