Poland’s Deadly Plane Crash: New Details on What Went Wrong

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A firefighter walking near some of the wreckage at the crash site where Polish President Lech Kaczynski, his wife and some of the country's most prominent military and civilian leaders died on Saturday April 10, 2010.

APTN / AP

Cell phones and cabin disturbances are now at the forefront of the investigation into last month’s fatal Polish-government plane crash.

The AP reports that at least two passengers were present in the cockpit before deceased President Lech Kaczynski’s private plane crashed. Another potential factor listed in the report — cell phone usage by individuals on board, affecting the crew’s ability to fly through thick fog.

For photos of Poland mourning the tragedy, view TIME’s gallery here.