Police spokesman Svend Foldager said the device would have had the explosive force of a hand grenade.
Its face is a large disc, painted dark blue, with what looks like a red-hot explosive force emanating from the centre.
By contrast, the first nuclear bomb tested by the U.S. in 1945 had an explosive force of about 18 to 20 kilotons.
By contrast, the first nuclear bomb tested by the U.S. in 1945 had an explosive force of approximately 18 to 20 kilotons.
Hitler escaped the full force of the blast when someone moved the briefcase next to a table leg, deflecting much of the explosive force.
The first one in 2006 produced a tremor that measured a magnitude 4.1, and analysts in the U.S. later estimated its explosive force at less than one kiloton.
The second one in 2009 produced a seismic tremor of 4.7 and an explosive force of about two to six kilotons, according to estimates by U.S. seismic and geological experts.
State-run KCNA news agency said the test was "carried out at a high level in a safe and perfect manner using a miniaturised and lighter nuclear device with greater explosive force than previously".
BBC: North Korea nuclear test branded 'serious threat' to US
Just this morning I turned on my car in the driveway (the car I lent to a 17-year-old African-born youth last night so he could drive with other African-born youths to a Korean take-out chicken place called Mo Betta Wings) and an X-rated hip-hop song blasted with such explosive force from the radio that, for a second, I thought I'd been in an accident.
The driver, who reportedly was smiling, then detonated the explosive, estimated to equal the force of 12, 000 pounds of TNT.
The following year he spoke about how he survived after the vehicle he was in was hit by an improvised explosive device or IED, with the force of the blast snapping a couple of the machine guns in half.
Task Force All American soldiers in the Al Anbar region captured several guerrilla suspects and seized "improvised explosive device-making materials, Fedayeen propaganda, two protective masks, and improvised mortar-making materials, " U.S. Central Command said.
According to Air Force officials, the 20.5 foot-long MOP carries over 5, 300 pounds of explosive material.
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