Brazilian investigators have blamed the two US pilots of a private jet for a mid-air collision with a Brazilian airliner, according to media reports.
All 154 people on board died when the Gol airliner plunged into the Amazon in the country's worst aviation disaster.
Federal police said the pilots had not noticed the failure of the plane's transponder, Brazil's O Globo reported.
The device sends out a signal alerting other planes and air traffic control to the presence of the aircraft.
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