Officials building a case against the Washington-area sniper suspects are using a new investigative tool to help trace their movements across the country.

He hopes to determine whether there is a pattern, and if so, whether it can help trace the spread.

Interpol has been called in to try and help trace a man who's been missing in Bosnia for almost a year.

He'd even questioned some of the older members of the Lucy Ghosts in private to help trace the fugitive.

Last night, Cheshire police began a detailed examination of shop security video films in the search for clues to help trace the bombers.

The record would help trace the guns used in crimes.

But the same information can also be used to help develop treatments or to use genetic fingerprinting to help trace the source of an attack.

In most cases the source IP address is logged to help trace the connection.

Secondary sources can help trace the history of scientific and mathematical ideas, including who is credited as the original source of the idea.

The researchers in both studies made use of a tiny ear bone found in fish larvae to help trace their whereabouts.