At first all seems to be plain sailing at this anti-U.S. march by Houthi rebels in northern Yemen.
Suddenly that all changes.
Footage supplied to Reuters by the rebels who control much of this region shows what they say is a bomb blast targeting the demonstration.
They say at least 22 people have been wounded in the blast.
A statement issued by the leader of the Houthi movement blamed the U.S. ambassador in Sanaa for the incident.
In a separate incident the same day a U.S. security team training Yemeni soldiers in the south was fired on by a gunman.
Paul Chapman, Reuters
