The FBI investigation has focused on an online persona named “Robert” who contacted American reporters, according to people familiar with the matter.

U.S. authorities are preparing to file criminal charges after the Trump campaign said in August that some of its internal communications were hacked and blamed the Iranian government, the Washington Post reported on Thursday,

WASHINGTON — The Justice Department is preparing criminal charges in connection with an Iranian hack that targeted Donald Trump’s presidential campaign, two people familiar with the matter said Thursday.

The Trump campaign disclosed on Aug. 10 that it had been hacked and said Iranian actors had stolen and distributed sensitive internal documents.