Report: Defense Department official says North Korea could develop hydrogen bomb

North Korea could develop a bomb more powerful than the atomic bombs dropped on Japan in the 1950's.

The bomb in question is a hydrogen bomb, also known as the ultimate atomic weapon.

It has the potential to kill millions of people, and North Korea reportedly might be able to develop one as soon as six to 18 months.

RELATED: A look at North Korea's missiles

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North Korea's Missiles
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North Korea's Missiles
The scene of the intermediate-range ballistic missile Pukguksong-2's launch test in this undated photo released by North Korea's Korean Central News Agency (KCNA) May 22, 2017. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT.
The long-range strategic ballistic rocket Hwasong-12 (Mars-12) is launched during a test in this undated photo released by North Korea's Korean Central News Agency (KCNA) on May 15, 2017. KCNA via REUTERS REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT.
Missiles are driven past the stand with North Korean leader Kim Jong Un and other high ranking officials during a military parade marking the 105th birth anniversary of North Korea's founding father, Kim Il Sung, in Pyongyang, April 15, 2017. REUTERS/Sue-Lin Wong
North Korean leader Kim Jong Un inspects the long-range strategic ballistic rocket Hwasong-12 (Mars-12) in this undated photo released by North Korea's Korean Central News Agency (KCNA) on May 15, 2017. KCNA via REUTERS REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. TPX IMAGES OF THE DAY
People cheer as a missile is driven past the stand with North Korean leader Kim Jong Un and other high ranking officials during a military parade marking the 105th birth anniversary of country's founding father Kim Il Sung, in Pyongyang April 15, 2017. REUTERS/Damir Sagolj
Military vehicles carry missiles with characters reading 'Pukkuksong' during a military parade marking the 105th birth anniversary of country's founding father, Kim Il Sung in Pyongyang, April 15, 2017. REUTERS/Damir Sagolj TPX IMAGES OF THE DAY
North Korean leader Kim Jong Un supervised a ballistic rocket launching drill of Hwasong artillery units of the Strategic Force of the KPA on the spot in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang March 7, 2017. KCNA/via REUTERSATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO THIRD PARTY SALES. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA. TPX IMAGES OF THE DAY
A fire drill of ballistic rockets by Hwasong artillery units of the KPA Strategic Force is pictured in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang September 6, 2016. KCNA/via Reuters ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NO THIRD PARTY SALES. SOUTH KOREA OUT. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS.
FILE PHOTO - An underwater test-firing of a strategic submarine ballistic missile is seen in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on April 24, 2016. KCNA/File Photo via REUTERS. ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. SOUTH KOREA OUT.
A view of a firing contest among multiple launch rocket system (MLRS) batteries selected from large combined units of the KPA, in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on December 21, 2016. KCNA/via Reuters ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NO THIRD PARTY SALES. SOUTH KOREA OUT. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS.
Ballistic rocket is seen launching during a drill by the Hwasong artillery units of the KPA Strategic Force in this undated picture provided by KCNA in Pyongyang on July 21, 2016. KCNA/via ReutersATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. SOUTH KOREA OUT. NO THIRD PARTY SALES. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS.Ã TPX IMAGES OF THE DAY
A test launch of ground-to-ground medium long-range ballistic rocket Hwasong-10 in this undated photo released by North Korea's Korean Central News Agency (KCNA) on June 23, 2016. REUTERS/KCNA ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO THIRD PARTY SALES. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. TPX IMAGES OF THE DAY
A new multiple launch rocket system is test fired in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang March 4, 2016. REUTERS/KCNA ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA
A rocket is launched during a demonstration of a new large-caliber multiple rocket launching system attended by North Korean leader Kim Jong Un (not pictured) at an unknown location, in this undated file photo released by North Korea's Korean Central News Agency (KCNA) on March 22, 2016. REUTERS/KCNA/Files ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. TPX IMAGES OF THE DAY
A rocket is fired during a drill by anti-aircraft units of the Korean People's Army (KPA) in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang November 3, 2015. REUTERS/KCNA ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.
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The director of defense studies at the Center for National Interest Harry Kazianis -- who is also a North Korea expert -- wrote an opinion piece for Fox News about a U.S. Defense Department official who told him that North Koreans appear to be working to finish the development of a Hydrogen bomb.

"A Defense Department official I spoke to recently on the condition of not revealing his name told me it now appears the North Koreans are working to finish development of an H-bomb, and that they could succeed in as soon as six to 18 months," Kazianis writes. "Such a bomb would be many times more powerful than the atomic bombs the United States dropped on Hiroshima and Nagasaki in Japan that led to the end of World War II."

Last year North Korean Dictator Kim Jong Un claimed to have tested an H-bomb. Most experts argued that they had developed a more powerful atomic bomb, but not a hydrogen bomb.

Even if North Korea develops an H-bomb, some experts argue there is no clear evidence they have developed any type of atomic bomb small enough to fit on an intercontinental ballistic missile, or ICBM -- let alone develop a miniature H-bomb that would fit on an ICBM.

If they were successful in completing such a feat, an H-bomb could cause a death toll of over 1.7 million if it hit New York City.

RELATED: Inside North Korea's secretive missile program

11 PHOTOS
Inside North Korea's secretive missile program
See Gallery
Inside North Korea's secretive missile program
A missile is carried by a military vehicle during a parade to commemorate the 60th anniversary of the signing of a truce in the 1950-1953 Korean War, at Kim Il-sung Square in Pyongyang July 27, 2013. REUTERS/Jason Lee (NORTH KOREA - Tags: POLITICS MILITARY ANNIVERSARY)
Engineers check the base of Unha-3 (Milky Way 3) rocket sitting on a launch pad at the West Sea Satellite Launch Site, during a guided media tour by North Korean authorities in the northwest of Pyongyang April 8, 2012. REUTERS/Bobby Yip (NORTH KOREA - Tags: POLITICS MILITARY SCIENCE TECHNOLOGY)
A North Korean scientist looks at a monitor showing the Unha-3 (Milky Way 3) rocket on a launch pad at the West Sea Satellite Launch Site, at the satellite control centre of the Korean Committee of Space Technology on the outskirts of Pyongyang April 11, 2012. North Korea said on Wednesday it was injecting fuel into a long-range rocket ahead of a launch condemned by its neighbours and the West. The launch is set to take place between Thursday and next Monday and has prompted neighbours such as the Philippines to re-route their air traffic. REUTERS/Bobby Yip (NORTH KOREA - Tags: POLITICS MILITARY SCIENCE TECHNOLOGY TPX IMAGES OF THE DAY)
A soldier stands guard in front of the Unha-3 (Milky Way 3) rocket sitting on a launch pad at the West Sea Satellite Launch Site, during a guided media tour by North Korean authorities in the northwest of Pyongyang April 8, 2012. REUTERS/Bobby Yip (NORTH KOREA - Tags: POLITICS MILITARY TPX IMAGES OF THE DAY)
North Korean soldiers salute in a military vehicle carrying a missile during a parade to commemorate the 60th anniversary of the signing of a truce in the 1950-1953 Korean War, at Kim Il-sung Square in Pyongyang July 27, 2013. REUTERS/Jason Lee (NORTH KOREA - Tags: POLITICS MILITARY ANNIVERSARY)
Ko Yun-hwa (L), Administrator of Korea Meteorological Administration, points at where seismic waves observed in South Korea came from, during a media briefing at Korea Meteorological Administration in Seoul, South Korea, January 6, 2016. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY
A sales assistant watches TV sets broadcasting a news report on North Korea's nuclear test, in Seoul, January 6, 2016. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY
Workers construct a new nuclear reactor in the North Korean village of Kumho in this file photo taken August 7, 2002. The United States urged North Korea December 21, 2002 not to restart a nuclear reactor suspected of being used to make weapons-grade plutonium. The International Atomic Energy Agency (IAEA) said that North Korea had disabled surveillance devices the agency had placed at the five-megawatt Nyongbyong reactor. REUTERS/Lee Jae-won/File Photo LJW/RCS/AA
A passenger walks past a television report on North Korea's nuclear test at a railway station in Seoul February 12, 2013. North Korea conducted a nuclear test on Tuesday, South Korea's defence ministry said, after seismic activity measuring 4.9 magnitude was registered by the U.S. Geological Survey. The epicentre of the seismic activity, which was only one km below the Earth's surface, was close to the North's known nuclear test site. REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: POLITICS TPX IMAGES OF THE DAY)
A scientist stands beside the Kwangmyongsong-3 application satellite, to be put onto the Unha-3 (Milky Way 3) rocket at the West Sea Satellite Launch Site, during a guided media tour by North Korean authorities in the northwest of Pyongyang April 8, 2012. REUTERS/Bobby Yip (NORTH KOREA - Tags: POLITICS MILITARY SCIENCE TECHNOLOGY)
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