Seattle Police K9 officer Craig Williamson stands with his explosives detection dog, "Dennis" as he patrols downtown Seattle, Monday, April 15, 2013, in reaction to explosions at the Boston Marathon finish line earlier in the day. A Seattle Police blog posting said that although there was no indication of a direct threat to Seattle, officers would be increasing patrols and activity around the city. (AP Photo/Ted S. Warren)

Associated Press
Seattle Police K9 officer Craig Williamson stands with his explosives detection dog, "Dennis" as he patrols downtown Seattle, Monday, April 15, 2013, in reaction to explosions at the Boston Marathon finish line earlier in the day. A Seattle Police blog posting said that although there was no indication of a direct threat to Seattle, officers would be increasing patrols and activity around the city. (AP Photo/Ted S. Warren)
Seattle Police K9 officer Craig Williamson stands with his explosives detection dog, "Dennis" as he patrols downtown Seattle, Monday, April 15, 2013, in reaction to explosions at the Boston Marathon finish line earlier in the day. A Seattle Police blog posting said that although there was no indication of a direct threat to Seattle, officers would be increasing patrols and activity around the city. (AP Photo/Ted S. Warren)
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