The bomb was found at a construction site in the Gallus district and the site had to be cordoned off within 700 m because of the damage the device could cause if it were to explode, according to the same sources.
Due to restrictions due to the Covid-19 pandemic, the operation could take some time and continue into the evening, according to the authorities.
Germany remains littered with unexploded bombs that are often found on construction sites, 75 years after the end of World War II.
Seven bombs were thus defused this year after being discovered on the first European site Tesla of electric cars which is to be launched near Berlin in 2021. Others were so this year in Cologne and Dortmund.
In 2017, the discovery in Frankfurt of a 1.4 ton bomb caused the evacuation of 65,000 people, the largest evacuation operation in Europe since 1945.
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