Israel confirmed that its warplanes had carried out an air strike in Syria, targeting a shipment of missiles reported to be destined for Lebanon.
Hundreds of Sunni Muslim families also fled the Syrian coast after massacres, reportedly carried out by government forces.
Tom Barton reports:
More top news
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.