There are reports that three Britons have been shot dead in the Costa del Sol.
The Spanish website sur.es claims they were found in a house in the Mijas resort south of Malaga on the southern coast of Spain.
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Two private citizens have already paid a "significant deposit" to take the week-long trip.
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The court will determine how much the UK government and travel firms knew about the risk of an attack on tourists holidaying in the area.