The inclusion of a fingerprint reader in Apple's new iPhone 5S could encourage thieves to mutilate owners in order to gain access to their phones, a security expert has warned.
Marc Rogers of mobile security firm Lookout said thieves "have worked out that you can force a victim to unlock a secured device" and have even been known to cut people's fingers off.
They have also succeeding in lifting and duplicating prints with technology that "is only going to improve with time", he added.
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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.