US will "turn over every rock" to find source of classified Ukraine documents leak: Pentagon chief

Speaking to journalists in Washington, D.C., on Tuesday, U.S. Defense Secretary Lloyd Austin said that the U.S. will continue to investigate the recent purported leak of classified documents until the source of them is found.

Austin said that though he could not address the reports of unauthorized disclosure of classified Pentagon materials on Ukraine war with detail while an investigation is ongoing, he said that the government takes the leak “very seriously.”

Separately, the chief of Australia's Defence Force Angus Campbell also said on Tuesday that the possible U.S. intelligence leak was a “serious” incident, adding that "anything that undermines the security, stability and prosperity of the Indo-Pacific region… is of interest to Australia.”

Three U.S. officials have said national security agencies are reviewing how they share their most sensitive secrets inside the government and tackling the diplomatic fallout from the release of dozens of confidential documents.