The couple had been under intense media pressure since they met at St Andrews University, Fife, in 2001, BBC royal correspondent Peter Hunt said.
The prince’s move to an army camp in Dorset, and Miss Middleton continuing her life in London, are also said to have put a strain on the relationship.
Clarence House has not commented on the split. There had been speculation about a possible engagement in recent months.
A text message alleging radioactive rain in the Philippines and Hong Kong did not originate from the BBC.
Tickets for the London 2012 Olympics have gone on sale, 500 days ahead of the event.
Some 6.6 million tickets are available from the London 2012 website over a six-week period and organisers say all applications will be treated equally.
Prices range from £20 to £2,012 and oversubscribed events will be decided by a ballot.
The ticket website initially failed to process the orders of people whose Visa card expires before August.
Japan’s crisis following the tsunami and earthquake is the “worst since World War II.” [Read the latest • See more photos]
The area around the port city of Sendai was worst hit by the 8.9 magnitude quake and subsequent tsunami. More than 24 hours on, fires continue to rage at an industrial complex. [See more photos]