President says he had been scheduled to meet with Afghan leaders and heads of insurgent group at Camp David, but nixes summit over upsurge in violence meant to build leverage
International Atomic Energy Agency says looking into reports Tehran began injecting uranium gas into advanced centrifuges in breach of 2015 nuclear pact with world powers
Abdullah Morsi suffers heart attack in Cairo; he was detained last year for alleged membership in Muslim Brotherhood and had campaigned to improve his father's prison conditions
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