A party of six climbers caught up in an avalanche in Glencoe in the Scottish Highlands have now all been located.
However, there is no immediate information on the condition of the three who had been missing, said Northern Constabulary.
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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.