The Department of Justice has opened an investigation into the recent leaks of a trove of US intelligence documents that were posted on social media. The documents, which are labeled "Top Secret," contain sensitive information that could be used to undermine US security. A senior US official has said that the government's "working theory" is that the documents are real, although some of them could have been altered. The investigation is ongoing and the US government is taking the matter seriously to ensure that the security of its classified information is not compromised.