The tree is lit on Pioneer Courthouse square Friday night, Nov. 26, 2010, to the music of Pink Martini in front of a shoulder-to-shoulder crowd singing holiday music in the square. A Somali-born teenager, Mohamed Osman Mohamud, 19, was arrested at 5:40 p.m. just after he dialed a cell phone that he thought would blow up a van laden with explosives but instead brought federal agents and Portland police swooping in to take him into custody, federal prosecutors said. (AP Photo/Torsten Kjellstrand -- The Oregonian)

Photo by: Torsten Kjellstrand

The tree is lit on Pioneer Courthouse square Friday night, Nov. 26, 2010, to the music of Pink Martini in front of a shoulder-to-shoulder crowd singing holiday music in the square. A Somali-born teenager, Mohamed Osman Mohamud, 19, was arrested at 5:40 p.m. just after he dialed a cell phone that he thought would blow up a van laden with explosives but instead brought federal agents and Portland police swooping in to take him into custody, federal prosecutors said. (AP Photo/Torsten Kjellstrand -- The Oregonian)