The female driver who died following a car chase with police near the White House has been named as 34-year-old Miriam Carey from Stamford in Connecticut.
Her former employee at a dental clinic, Dr Barry Weiss, told NBC News she had worked as a dental hygienist and described her as an "average employee".
The Washington Post reports that she graduated from Hostos Community College in the Bronx with an associate's degree in dental hygiene, and appears to have gone on to Brooklyn College to study health and nutrition science.
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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.