Pentagon Documents Leak a Risk to US National Security

The Pentagon says a leak of classified US Defence Department documents is a "very serious" risk to national security. <br />The documents appear to include sensitive information regarding the war in Ukraine, as well as on China and US allies. <br />Officials say the files are in a format similar to documents issued to senior leaders. <br />An investigation has been opened to determine the source of the leak. <br />The documents - some of which officials say may have been altered - first appeared on online platforms such as Twitter, 4chan and Telegram, as well as on a Discord server for the video game Minecraft.