A theory for the incident suggests that the Tu - 144 swerved to avoid the Mirage and lost control , breaking up before impacting the ground .
Shortly before the accident , a Mirage IIIR had taken off from the airport .
A theory for the incident suggests that the Tu - 144 swerved to avoid the Mirage IIIR and lost control , breaking up before impacting the ground .
Shortly before the accident , a Mirage IIIR had taken off from the airport .