An undated image released by ROK's defence ministry in Seoul Dec 23, 2012, shows that a piece of wreckage of DPRK's Unha-3 (Milky Way 3) rocket is seen on a navy vessel of ROK's navy after it was pulled up. The piece is estimated as a fuel tank of the rocket by the defence ministry. This month's rocket launch by reclusive DPRK shows it has likely developed the technology, long suspected in the West, to fire a warhead more than 10,000 km (6,200 miles), ROK's officials said on Sunday, putting the US West Coast in range.[Photo/Agencies]