A 500-pound bomb the United States dropped during a bombing raid over Italy during World War II didn’t explode -- until Sunday.

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The bomb was found near a cathedral in Balzano, not far from a train station, the likely intended target, during construction of a shopping center, the ANSA news agency reported.

About 4,000 people were evacuated while experts spent more than three hours defusing the bomb before it was taken to a controlled site and detonated, online newspaper Neue Suedtiroler Tageszeitung reported.

The Associated Press contributed to this report.

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