The information and purpose of this broader appeal is based on phone traffic analysis we have examined, which determines the footfall of people in the resort at that time. Our investigation in the UK remains ongoing.
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Some holidaymakers in Tunisia are determined not to be beaten, but it's not goign to be easy to escape the horror of Friday's massacre.
Drink lots of water, stay out of the sun during the middle of the day, and take particular care of vulnerable people.
The 81-year-old has disappeared from his home on the Spanish island on the hottest day of the year so far.