Tour operator First Choice say they are investigating the circumstances surrounding Chloe's death.
In a statement they said:
"First Choice can sadly confirm that a child has died while staying at the Coral Sea Waterworld hotel in Egypt. The incident occurred in a pool in the hotel's waterpark.
Our thoughts and condolences are with the family at this extremely difficult time. The British Consulate were immediately informed and they are now working with our dedicated resort team in Egypt, to offer every assistance possible to the family in resort."
More top news
The plaque at number 16 Cowley Street in Westminster marks the brown brick Georgian townhouse where Sir John lived for 31 years.
A man reportedly armed with several knives has been arrested in Whitehall on suspicion of planning a terror attack, police have said.
Metropolitan Police officer, Tom Harrison, has been crawling the course since the race began on Sunday morning.