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US intelligence officials said they believe pro-Russian separatists in eastern Ukraine probably shot down MH17 "by mistake".
However, the US admitted not knowing exactly who fired the surface-to-air missile that downed the Malaysian Airlines plane.
Russia is continuing to deliver more weapons, including rockets and tanks, to separatists, officials added.
The intelligence officials also said the US did not know separatists had Russian SA-11 missiles until after the plane was hit.
The body of a 13-year-old boy has been recovered from the River Thames near Marlow.
Thames Valley Police were called to reports of a person in difficulty in the river at around 4.30pm today.
The teenager's body was subsequently found at just after 8pm following a search.
Police said they were not treating the boy's death as suspicious at this stage.
A stolen rabbit posted through a letterbox in a "silly prank" has been returned to its owner.
The white rabbit was found on top of a stack of letters and cards by a postman on Saturday morning in Maltby, south Yorkshire.
The pet's owners were eventually identified by the RSPCA, only after the charity received numerous offers to re-home the animal.
The RSPCA, who have launched an investigation into the incident, said the rabbit had been taken from its hutch.
"Clearly this was a silly prank that could have resulted in the rabbit being seriously hurt," a spokesperson for the animal charity said.
A host of European and US airlines have cancelled or suspended flights to Tel Aviv, Israel, due to the escalating conflict in the region.
The Europe Air Safety Agency issued a "strong recommendation" to avoid the airport, while the US Federal Aviation Administration prohibited Delta, US Airways and United - the three airlines that fly to Israel - from travelling to Tel Aviv.
Dutch airline KLM, Air France and German company Lufthansa have all suspended flights to Ben Guiron Airport.
A Turkish Airlines plane from Istanbul to Israel turned back after flights were halted for 24 hours.
With only one day to go before the opening ceremony of the 2014 Commonwealth Games, hundreds welcomed the Queen's baton as it arrived in Glasgow today.
After a 288 day tour of the Commonwealth, the baton finally arrived in the host city with many enjoying the atmosphere and festivities.
ITV News' Scotland Correspondent Debi Edward reports:
A Turkish Airlines plane from Istanbul to Tel Aviv has turned back after flights were halted for 24 hours, a company spokesman said.
Estimate, the racehorse which has tested positive for a banned substance, helped make sporting history for the Queen as she became the first reigning monarch to win Royal Ascot's Gold Cup.
The Queen was pictured beaming as Estimate crossed the line in first place during the dramatic race last year.
Prime Minister David Cameron congratulated the Queen in a tweet saying: ''Huge congratulations to Her Majesty for Estimate's victory at Royal Ascot - first time ever a reigning monarch's horse has won the Gold Cup.''
Her Majesty won £155,960 in prize money after Estimate's victory.
The Queen has been informed of her racehorse's failed drugs test, her majesty's racing advisor said.
Estimate, which won the Gold Cup at Royal Ascot in 2013, tested positive for morphine - a prohibited substance.
Sir Michael Stoute, the racehorse's trainer, is offering his "full co-operation" to the investigation, John Warren, from the Queen's bloodstock and racing advisor, said.
"Sir Michael is working closely with the feed company involved to discover how the product may have become contaminated prior to delivery to his stables,
"As the BHA investigates this matter, including potential links between the different cases, Sir Michael continues to offer his full co-operation.
"Her Majesty has been informed of the situation."
Tonight should be mild and muggy with temperatures as high as 17C in some places.
Tomorrow should be largely fine although there is a risk of showers and possibly the odd rumble of thunder as well later on.
Watch the latest weather forecast with ITV weather presenter Alex Beresford.