The National Transportation Safety Board says the probable causes of a midair collision over the Hudson River last year that killed nine people were the limitations of the “see and avoid” concept and an air traffic controller’s personal phone conversation at the time of the crash.

“The see-and-avoid technique of averting mid-air collisions was not effective because of the difficulty the airplane pilot had in seeing the helicopter until the final seconds before the collision,” the NTSB said in a written statement.

Several Italian tourists visiting New York from Bologna were among the nine victims killed when a sightseeing helicopter and a single-engine plane collided.

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(Source: CNN)