Seven bulls being used on the set of a film starring Tom Cruise and Cameron Diaz have broken free in Spain and slightly injured two people.

Tom and Cameron were not at the rehearsal, as the actors are scheduled to arrive in the city of Cadiz, in south-west Spain, for the filming of the Knight And Day movie next weekend.

Two unidentified women were slightly injured by the bulls as they broke free from the downtown location and ran through streets to a nearby beach.

It was not immediately clear if the women had anything to do with the film.

Film director Jose Luis Escolar told reporters he didn't know how the bulls had escaped.

Filming in Cadiz was due to begin on Monday, but local government spokesman Ignacio Romani said it has now been suspended until further notice.