At the center of a criminal probe involving Hillary Clinton’s handling of classified information is a series of emails between American diplomats in Islamabad and their superiors in Washington about whether to oppose specific drone strikes in Pakistan.
The 2011 and 2012 emails were sent via the “low side’’—government slang for a computer system for unclassified matters—as part of a secret arrangement that gave the State Department more of a voice in whether a Central Intelligence Agency drone strike went ahead, according to congressional and law-enforcement officials briefed on the Federal Bureau of Investigation probe.
Some of the emails were then forwarded by Mrs. Clinton’s aides to her personal email account, which routed them to a server she kept at her home in suburban New York when she was secretary of state, the officials said. Investigators have raised concerns that Mrs. Clinton’s personal server was less secure than State Department systems.
The vaguely worded messages didn’t mention the “CIA,” “drones” or details about the militant targets, officials said.