1.   I tracked the boy as far as the factory, but there his trail went cold.

2.   Police tracked him to Valencia and there the trail went cold .

3.   At the battlefield, a walking trail goes through gently rolling prairie grassland and a wooded area.

4.   After Camarena-Macias fled, his trail went cold for years.

5.   But for truly big money, the trail goes to American-based international corporations that sponsor the Olympic movement and also advertise on television.

6.   But the trail soon went cold last month after the pair turned in a rental car in Berkeley.

7.   Even with the utmost cooperation, however, the trail can go cold if perpetrators used fake identities and addresses.

8.   Federal officials say the trail has gone cold and is too broad to make any more headway.

9.   For one thing, the trail went through the town in which he lived, so the idea was always there, beckoning with deceptive charm.

10.   From the visitors center, cliff top hiking trails go north and south and offer a superb view of an ocean sunset.