The condition of Omurbekov, believed to be the target of the bombing, is unknown, but one local report said he 'narrowly survived'.
'There is to be no hesitation,' the President wrote.
The finds, in the water between the port city of Algeciras and the Rock of Gibraltar span a period from the fifth century BC to World War Two
A gunman shot a Canadian woman dead and injured several others before killing himself, police said.
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