Cameras disrupt Beijing flights
Flights were disrupted at Beijing's airport because of interference from radio-controlled cameras 14km (9 miles) away, a Chinese investigation says.
Three small cameras fitted on lifts at a building were responsible, China Daily newspaper said on the findings.
"The radio waves severely disturbed normal flight take-off and landings," said Su Qing of the Northern China Air Traffic Management Bureau.
The report did not say when the interference occurred.
Beijing's airport is being expanded ahead of next year's Summer Olympics.
"The radio was using the same frequency channel as the airport radar, therefore, largely dampening the performance," Mr Su told China Daily.
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