Shooting has begun of the third instalment of High School Musical at East High School in Salt Lake City.

Stars of the hit movies appeared at a specially held press conference on Friday to mark the beginning of filming High School Musical 3: Senior Year. Despite being grilled by the international media, the cast were adamant not to reveal any secrets. According to rumours the plot centres on the senior prom and whether Troy and Gabriella are to remain sweethearts or go their separate ways after they graduate.

Asked whether there was any pressure for HSM3 to top the previous two movies Zac Efron who plays basketball hot shot Troy Bolton said "I kind of think of it as the third act. This is the third movie. We're not looking to top anything, just to do it justice."

On the first day’s shoot on Saturday Ashley Tisdale was given a police escort. The officer was only seen to leave her side when she was actually involved in shooting a scene.  Tisdale was seen looking unsociable and down at the mouth, reportedly not speaking to other cast members except Vanessa Hudgens who wasn’t working but had turned up to hang out with her co-stars.

The movie will hit the silver screen on October 24th!