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The killer vanished into the night, leaving a cold trail behind him.
FORBES: Halloween Murder of Trick-or-Treater Still Unsolved 17 Years Later
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He was tracked to Jordan and then, possibly, Syria before his trail went cold.
FORBES: Kidnap Inc.
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After his indictment the FBI followed him through Illinois, Indiana and out west to Arizona, but the trail ran cold.
BBC: Eric Justin Toth
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Police, sheriff's deputies and federal agents swarmed into the area, working through a weekend blizzard, but the trail was cold for days.
CNN: STORY HIGHLIGHTS
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"There are multiple jurisdictions and unless it's an ongoing crime that uses the same path all the time, the trail goes cold quickly, " Spafford said.
CNN: Twitter message could be cyber criminal at work
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But it also demanded the very best of our people -- the highest level of creativity, dedication, teamwork, analysis, and just sheer, dogged determination to never give up when the trail went cold.
WHITEHOUSE: President Obama Thanks the Intelligence Community
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Still, the trail remained cold.
WSJ: U.S. Rolled Dice in bin Laden Raid
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The trail went cold.
ECONOMIST: A horrible case shows the need for competent policing
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Pakistan is where most intelligence analysts suspect the al Qaeda leader is hiding, probably somewhere along the mountainous border with Afghanistan, so Musharraf's assertion that the trail has gone cold can't be good news.
CNN: Where's Osama?