No bodies were ever found, leaving police to suspect that Chivers was also a victim.

CNN: Ambush suspected after man, daughter vanish

Skiba was the likely target, they say, and Sarah and Chivers were bystanders.

CNN: Ambush suspected after man, daughter vanish

Mr Chivers said he was encouraged by reported improvements in the survey in areas such as availability and comfort of seats on trains.

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Mr Chivers believes the benefits to the UK will be huge.

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Chivers' and Skiba's personal cars, which they had left at the lot during their Sunday moving jobs, were parked at separate apartment complexes across Denver.

CNN: Ambush suspected after man, daughter vanish