WASHINGTON (AP) — German Chancellor Angela Merkel complained to President Barack Obama in a phone call this week after receiving information that her cellphone may have been monitored by U.S. intelligence agencies. The White House said the U.S. isn’t monitoring and won’t monitor Merkel’s communications — but didn’t address what might have happened in the past.

A look at some of the questions swirling around overseas surveillance by the National Security Agency, which has angered allies on two continents and caused concern domestically over the scope of the intelligence-gathering:

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