Payouts have pulled some fishermen in the Ecuadorean city of Manta into drug trafficking, while U.S. strikes at sea have also targeted those who deny any role in the trade.

Conflicting accounts from a bystander who called the police and from President Trump have led to questions about whether security services knew about the possible plot in advance. By Michael D. Shear The administration is brokering deals in a notoriously ...

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The rapid advances of Chinese artificial intelligence over the past year seem to have alerted Washington to the real possibility that the world’s second-largest economy could pull ahead of the United States in an increasingly tight technology race.