The tail of the Asiana Airlines plane hit the approach of the runway in San Francisco as it came in for landing, South Korea's transportation ministry confirmed.
"The tail of the Asiana flight hit the runway and the aircraft veered to the left out of the runway," the ministry said in a statement.
A team is inspecting the site of the accident.
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Mladic, now 75, was the military commander of Bosnian Serb forces in the 1990s, who fought against the Bosnian Croat and Bosniak armies.
Weather: Heavy rain and strong winds in the north
His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."