Officials say the leaked files appear to be in a format similar to those issued to senior leaders.
The leaked documents appear to show highly detailed US intelligence on the state of the Ukraine-Russia warA leak of classified US Defence Department documents is a "very serious" risk to national security, the Pentagon has said.
In addition to highly detailed information about the war in Ukraine, some of the leaked documents are said to cast light on sensitive briefing materials relating to US allies. "There have been steps to take a closer look at how this type of information is distributed and to whom." The format of the documents is similar to that "used to provide daily updates to our senior leaders on Ukraine and Russia-related operations, as well as other intelligence updates," Mr Meagher added.
At a separate briefing, national security spokesman John Kirby said that US President Joe Biden was first briefed about the leak last week.
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