European, US detectives join on attache's case

French investigators have joined forces with American and West European security services in a manhunt for the assassin who shot and killed Lt. Col. Charles Ray, a US military attache, on a Paris street.

Police said French security services have established close ties with US and West European police networks because they said the killer probably belongs to a broader terrorist network covering a number of countries.

US Ambassador Evan Galbraith told reporters he ordered tighter staff security because of the killing.