Prince Charles' brother-in-law Mark Shand is in a critical condition in a New York hospital after falling and hitting his head during a night out on Tuesday (22Apr14).

Travel writer and conservationist Shand, the brother of Charles' wife Camilla, Duchess of Cornwall, is reported to have slipped and smacked his head on the pavement outside The Diamond Horseshoe nightclub, where the 62 year old was attending an after party hosted by auction house bosses at Sotheby's to celebrate its annual Faberge Big Egg Hunt.

A statement issued by representatives from royal residence Clarence House to the New York Post reads: "The Duchess of Cornwall's brother, Mark Shand, has been taken to a New York hospital after falling and sustaining a serious head injury.

"The Duchess, her family and The Prince of Wales are clearly deeply concerned and are being kept closely informed."