(CNN) -- Noah and Connor Barthe, the two boys apparently killed by a 100-pound African rock python in Canada, died from asphyxiation, according to preliminary autopsy results.
"While we now have some preliminary information, investigators still have to wait for other test results to come back and for the final report," said Sgt. Alain Tremblay of the New Brunswick Royal Canadian Mounted Police.
"We recognize that this has touched the hearts of people across the world and that people want to know how this could have happened. Our investigators are looking at all aspects of this tragic incident, and that will take some time," he said.
CNN's Kevin Conlon contributed to this report.
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