Seattle Police officers, including Craig Williamson, center, and his explosives detection dog, "Dennis" confer as during a patrol in 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 officers, including Craig Williamson, center, and his explosives detection dog, "Dennis" confer as during a patrol in 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 officers, including Craig Williamson, center, and his explosives detection dog, "Dennis" confer as during a patrol in 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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