In this Nov. 26, 2010 photo, people sing as a Christmas tree is lit on Pioneer Courthouse square in Portland, Ore. Federal agents in a sting operation arrested a Somali-born teenager just as he tried blowing up a van full of what he believed were explosives at the crowded Christmas tree lighting ceremony, federal authorities said. The bomb was a fake supplied by the agents and the public was never in danger, authorities said.  (AP Photo/The Oregonian, Torsten Kjellstrand)

Photo by: Torsten Kjellstrand

In this Nov. 26, 2010 photo, people sing as a Christmas tree is lit on Pioneer Courthouse square in Portland, Ore. Federal agents in a sting operation arrested a Somali-born teenager just as he tried blowing up a van full of what he believed were explosives at the crowded Christmas tree lighting ceremony, federal authorities said. The bomb was a fake supplied by the agents and the public was never in danger, authorities said. (AP Photo/The Oregonian, Torsten Kjellstrand)