By Jonathan Dienst, Kelly O'Donnell and Mirna Alsharif -
NBC News
The FBI and the Department of Homeland Security issued a joint intelligence bulletin warning of increased threats against federal law enforcement officials since the raid on Mar-a-Lago, former President Donald Trump's Florida residence, according to two senior officials who spoke with NBC News.
"The FBI and DHS have noted an increase in threats to federal law enforcement and, to a lesser extent, other law enforcement and government officials following the recent execution of a search warrant in Palm Beach, Florida." says the document dated Friday, an official said.
The bulletin, which specifies that such threats are occurring online, was sent out of an abundance of caution, officials said.
The document instructs authorities to be vigilant and aware of issues related to domestic violent extremists due to past and current incidents.
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Another official said the five-page document states that those threats are being made on multiple platforms, "including social networking sites, web forums, video-sharing platforms and image forums."
The FBI also warned that information and personal data about people who could suffer acts of violence such as addresses have been published.
Also, in some cases, family members have been identified as additional targets, the official added.
All three sources spoke on condition of anonymity.
The FBI searched Mar-a-Lago, Trump's residence, last Monday.
A senior government official said the FBI was on the scene for "most of the day" and confirmed the search warrant was related to the National Archives.
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After the operation, pro-Trump internet forums erupted with violent threats and calls for civil war.
The bulletin cites an incident in which a man fired a nail gun at the FBI field office in Cincinnati as one of the attacks on federal forces, the officials said.
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The man, whom two law enforcement sources identified as Ricky Shiffer, was killed in a confrontation with police.
It appears that Shiffer posted online about his desire to kill the FBI agents.
The intelligence bulletin, which was sent out Friday night, seeks to raise awareness after the names of two FBI agents involved in the Mar-a-Lago search were made public, two Secret Service officials said.
According to the officials, who spoke on condition of anonymity, the Secret Service is strengthening its field offices and encouraging surveillance among all protection elements and stationary posts, especially at the White House and other well-marked locations.
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Trump received a federal grand jury subpoena this spring for confidential documents the government believes he has kept after leaving the White House, a source familiar with the matter confirmed Thursday.
The receipt for the recovered items shows that FBI agents recovered a set of confidential documents and other highly classified information, according to court documents released Friday by a federal judge in Florida.
[FBI director denounces threats against agency after Mar-a-Lago search]
Federal agents removed 11 sets of classified documents, including some that were classified as secret and top secret, according to documents obtained by NBC News shortly before the judge unsealed them.
Among the items the FBI seized were a handwritten note containing information about the "president of France," an executive order granting Trump ally Roger Stone clemency, and folders of photographs.
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"Confidential compartmentalized information" was also found.
On Friday, the Justice Department filed a notice saying Trump did not object to the release of the findings.
Although Trump and his allies have suggested that he had declassified all the documents in his possession, three laws cited in the search warrant do not specify that the tampered with documents had to be classified.
Trump spokesman Taylor Budowich dismissed the details of the documents in a statement Friday, calling the search "outrageous" and a "botched raid."
