In pictures: Harry Potter 3 film

1 of 4 Photographs from the third Harry Potter film have been released by film studio Warner - showing how the stars are growing up.

2 of 4 Michael Gambon is seen as Dumbledore for the first time - he takes the place of Richard Harris, who died in February.

3 of 4 Gary Oldman (right) plays Sirius Black, who escapes from Azkaban prison and is suspected of wanting to kill Harry.

4 of 4 Daniel Radcliffe, who plays Harry, and Rupert Grint, who plays Ron, are now both 14. Emma Watson, who plays Hermione, is 13.