31.   The Treasury Department previously had created a foreign asset tracking center to trace the source of money that funds terrorists and to freeze it to disrupt further operations.

32.   Torres said extensive drug surveillance usually traces the source of drugs in the Valley to rich, powerful families in Mexico.

33.   USDA investigators continued their search of plant records in Nebraska and Arkansas, attempting to trace the source of the E. coli contamination.

34.   While the hacker roots around in those files, system administrators have time to trace the source of the attack.

35.   Police are now trying to trace their source.

36.   After failing to trace the source of the money, prosecutors said later Thursday that the scandal might have started from mere rumors.

37.   Authorities moved aggressively elsewhere around the United States to trace the source of tainted mailings, and to respond to fresh threats.

38.   Authorities moved aggressively elsewhere around the nation to trace the source of tainted mailings, and to respond to fresh threats.

39.   Authorities said Monday they had traced the source of riot rumors that led Malaysians in the capital to lock themselves indoors over the weekend.

40.   Barcelona police were tipped off by U.S. officials who traced the source of the network to Barcelona.