During the final months of the Clinton email investigation, FBI agent Peter Strzok was advised of an irregularity in the metadata of Hillary Clinton’s server that suggested a possible breach, but there was no significant follow up, according to two sources with knowledge of the matter.

Sources told Fox News that Strzok, who sent anti-Trump text messages that got him removed from the ongoing Special Counsel Robert Mueller’s Russia probe, was told about the metadata anomaly in 2016, but Strzok did not support a formal damage assessment.

Fox News is told the Justice Department Inspector General, Michael E. Horowitz, is aware of the allegations.

According to intelligence community directive 732, damage assessments are done “in response to unauthorized disclosure or compromise of classified national intelligence.”

Intelligence beyond top secret was identified on the Clinton server. As secretary of state, Clinton chose to use a private, non-secure server for government business.