At least 800,000 people displaced by the war in Yemen have fled to the city of Marib.
It is the last stronghold of the internationally recognised government and is at the centre of Yemen’s oil fields.
Houthi rebels are pushing hard to capture or encircle the city – if it falls it would be a major turning point in the war.
The BBC’s Jeremy Bowen travelled to Marib, where he met children "haunted" by the people they saw killed in the war.
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