Brad Pitt's 'World War Z' co-stars Matthew Fox, Ed Harris quit

Brad Pitt's new zombie movie World War Z may have hit a snag after it was reported that two of his co-stars, Matthew Fox and Ed Harris, quit the project.

According to Vulture.com, the film is currently in pre-production on the Mediterranean island, Contactmusic reported.

It has been revealed that Fox, 44, quit the film due to a conflict in schedule.

But the reason behind 60-year-old Harris' departure is not known.