Intelligence shared between various police sources suggests the terrorists are planning to attack the Cannes Film Festival in May (03).
French police have been keeping a close eye on a group of Al Qaeda activists - the organisation led by OSAMA BIN LADEN - near Marseille.
Security services in London, Paris and Washington all believe a retaliatory attack over the current Gulf war is imminent.
Cruz and Ryan are both due to launch new films at the festival, while Zeta-Jones and husband Michael Douglas are also expected at the prestigious event.
A British intelligence source says, "We are very worried by the growth in Islamic terrorism in France and Europe.
"The French view is that there should be a Europe-wide anti-terrorist task force to police the problems as countries approach the problem in different ways."