Retired footballer David Beckham and Chinese basketball megastar Yao Ming will film two announcements with the Duke of Cambridge as part of a campaign against illegal wildlife products.
The videos aim to reduce deman for rhino horn and ivory and will be aired globally.
More top news
Michael Fallon has received reassurances from his US counterpart that security ties with Britain will "endure" following a vote for Brexit.
On Friday, police said it appeared the girl had shot herself in the face with the weapon.
The showers will be slow-moving, heavy and thundery at times, particularly in central and eastern areas.