June 4 (UPI) -- More than 20,000 people in Germany were evacuated as authorities worked Wednesday to defuse three huge unexploded bombs from World War II at a construction site in the center of the city.

A major incident was declared due to the danger from the bombs -- two 2,200 lb devices and one of 1,100 lbs -- with police making checks door-to-door in the Old Town and Deutz areas of Cologne after 20,500 people were ordered to leave and businesses, tourist attractions and stations were shuttered, the city said in a news release .

The 1,100-yard-wide exclusion zone covers the city's UNESCO-listed 13th-century cathedral, 58 hotels, parts of the subway system, at least nine schools, day care centers, two retirement homes, a hospital, as well as city hall and many other sites.

"The eva

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