Air Algerie flight AH5017, which had 116 on board, could have crashed as a result of a rainstorm, officials said.
The wreckage has now been found in a remote part of Mali and human remains have been spotted among scattered plane parts.
General Gilbert Diendere, an official from Burkina Faso where the plane took off, said it was located about 50 kilometers (31 miles) from the border of Burkina Faso near the village of Boulikessi in Mali.
More top news
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."