N.Korea 'Building Even Bigger Missile'

North Korea is building a missile that is even bigger than the long-range missile it is preparing to launch this month, sources claimed Monday. South Korean and U.S. officials believe the North will unveil the missile at a military parade on April 15, nation founder Kim Il-sung's centenary, or on April 25, which marks the founding day of the North's Army.

A government source here said U.S. reconnaissance satellites recently spotted a 40-m missile at a research and development facility in Pyongyang that is larger than the existing Taepodong-2 missile. "It remains uncertain whether this missile is functional or is just a life-sized mock-up," the official added.

The rocket North Korea is preparing to launch soon is apparently 32 m long, the same as the Taepodong-2 that was launched in April 2009 with a maximum range of 6,700 km. The new missile is believed to be larger and equipped with a bigger booster that gives it a maximum range of more than 10,000 km, making it capable of reaching the continental U.S.