Security fear for Duchess Kate and Prince William?

A police dog and his handler inspect cameras outside Sydney airport ahead of the arrival of Britain's Prince William, his wife Catherine, Duchess of Cambridge and their son Prince George in Sydney. (REUTERS)

A police dog and his handler inspect cameras outside Sydney airport ahead of the arrival of Britain's Prince William, his wife Catherine, Duchess of Cambridge and their son Prince George. (REUTERS)

Catherine, the Duchess of Cambridge, meets with emergency services personnel at Winmalee, an area in the Blue Mountains heavily affected by bushfires. (AFP)

Catherine, the Duchess of Cambridge, speaks with volunteers from the Rural Fire Service as the royal couple meets with emergency services personnel at Winmalee, an area in the Blue Mountains heavily affected by bushfires. (AFP)

Catherine, Duchess of Cambridge, laughs as she and her husband Britain's Prince William (not seen) put on earplugs as they prepare to board a Royal Australian Navy MRH90 helicopter at Sydney's Victoria Barracks in this picture released by the Australian Defence Force. (REUTERS)

Catherine, Duchess of Cambridge, and her husband Britain's Prince William prepare to board a Royal Australian Navy MRH90 helicopter. (REUTERS)

Catherine, Duchess of Cambridge, waves to residents as she walks with local official Miranda Hansen. (REUTERS)

Catherine, Duchess of Cambridge, receives a flower from a girl as she meets locals during her visit to the Blue Mountains suburb. (REUTERS)

Prince William and his wife Catherine, the Duchess of Cambridge, are greeted by children bearing gifts during their visit to the "Three Sisters" rock formation in the Blue Mountains town of Katoomba, west of Sydney. (REUTERS)

Prince William and his wife Catherine, the Duchess of Cambridge, are pictured during their visit to the "Three Sisters" rock. (REUTERS)

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge pose for a photo with Girl Guides after planting a tree at the Winmalee Guide Hall in Winmalee, Australia. (Photo by Getty Images)

Prince William and his wife Catherine, Duchess of Cambridge, hold cricket bats presented to them by Australian women's cricket team member Ellyse Perry (L) and former Australian cricket team member Glenn McGrath (R) near the Cricket World Cup trophy at the Sydney Opera House. (REUTERS)

Catherine, the Duchess of Cambridge, holds her son Prince George as his father, Britain's Prince William, holds a toy wombat that was given as a present to him from Australia's Governor-General Peter Cosgrove (2nd L) at Admiralty House in Sydney. (REUTERS)

(Photo by Getty Images)

(Photo by Getty Images)

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