Air Algerie flight AH5017 broke apart when it hit the ground, French investigators have concluded.
The finding suggests the cause of the crash is unlikely to have been an attack.
"We think the aircraft crashed for reasons linked to the weather conditions, although no theory can be excluded at this point," French Interior Minister Bernard Cazeneuve told RTL radio.
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Some 66 people have been killed after the plane they were travelling on crashed in southern Iran.
The letter calls for an end to harassment, abuse, and impunity in a world "ripe for change".
Police say that anyone who sees Whitehouse should not approach him, but instead call them on 999 and quote incident 23 of 18 February.