(CNN) More than 60,000 people are set to be evacuated from the center of Frankfurt on Sunday after a massive World War II bomb was discovered beneath the German city.

The bomb was found during work Tuesday on a construction site on Wismarer Street close to the Goethe University Frankfurt compound, according to a statement by Frankfurt police.

Police said the size of the bomb made extensive evacuation measures necessary.

The device is a British bomb, specifically a 1.4-ton HC 4000 air mine, the statement said, and is under guard by police. There is no danger to the public, police said, but they will be evacuating the area as a precaution while they defuse the bomb.

The evacuation will take place at 8 a.m. local time on Sunday, authorities said.

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