North Koreans have shown extraordinary displays of grief in the days since the death of their leader Kim Jong Il on December 17th. Today marked the start of a two-day funeral ceremony, as thousands of North Koreans lined the snowy streets of Pyongyang to witness the procession of vehicles as it made its way to Kumsusan Memorial Palace. Official North Korean news sources have been declaring Kim Jong Un the "great successor," but questions about the transition and future governance of the volatile, secretive state continue to make foreign governments wary. South Korean intelligence recently indicated that North Korea has tightened security in cities, put troops on alert and won loyalty pledges from top generals after Kim's death as it consolidates power behind the anointed heir. Collected here are images -- most of them official North Korean releases -- of the public mourning in North Korea.