A British businessman facing extradition to the US for alleged espionage is feared to have fled to China after escaping house arrest in Serbia, The Mail on Sunday can reveal.

John Miller and his Chinese 'handler' Cui Guanghai were arrested in Belgrade after an FBI sting operation in April, just hours before they were due to fly to Beijing.

The pair, accused of trying to buy weapons and sensitive military technology in the US for the Chinese military, had been under house arrest ever since as they awaited extradition to America.

But last month, while living in separate rented flats in the Serbian capital, the pair apparently removed their electronic surveillance tags and escaped house arrest at the same time.

Last night Mr Miller's brother Alan told the MoS: 'You would have thought they must have had some help and he will probably be in China. His son still lives there as far as I know.'