According to BBC News:
Simultaneous gun salutes have marked the birth of the Duke and Duchess of Cambridge’s first child in London.
The King’s Troop Royal Horse Artillery fired a 41-gun salute in Green Park at 14:00 BST, after riding past Buckingham Palace.
At the same time, the Honourable Artillery Company – the City of London’s army reserve regiment – fired a 62-gun salute from Gun Wharf at the Tower of London.
