The threat comes on the heels of a May 22 bombing at a Grande performance in Manchester, England, that killed 22 people and injured dozens more.
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The Costa Rica concert went ahead as scheduled Sunday in the city of Alajuela.
Costa Rican prosecutors said in a statement that the suspect is a Colombian citizen who made the threats online.
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Head Investigator Walter Espinoza told local media the threats were written in Arabic. He identified the suspect only by his family names, Caicedo Lopez.
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