The third explosion in the Turkish town of Reyhanli, close to the Syrian border, appears to have been a smaller blast caused by a car engine or a building boiler room, local reporters have told Reuters.
It followed two car bombs that exploded in the early afternoon in the city and killed around 40 people.
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The King and Queen of Spain joined mourners at a mass in Barcelona to remember victims of the terror attacks as a police manhunt continues.
Rain spreads further east through the day.
Renting vehicles is set to be made harder as hiring details offer a new lead in the hunt for the fugitive Barcelona attacks suspect.