North Korea started to developing chemical weapons in the 1960s
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North Korea started to developing chemical weapons in the 1960sCredit: Reuters

“Nuclear weapons are not the only threat,” Kelsey Davenport, director of  the Arms Control Association told the

“North Korea could respond to a US attack using chemical weapons. That would be devastating.”

The casualties would be unimaginable with some 23 million people live in the region of Seoul - parts of the city area mere 35 miles from the North Korean border.

While Pyongyang officials deny they possess any chemical weapons, the country began developing chemical weapons in 1961 amid rising tensions at that time.

The Korea Research Institute of Chemical Technology reports the country has four military bases equipped with chemical weapons and at least 11 facilities where they are produced and stored.