The FBI and the Department of Homeland Security have issued an unclassified joint intelligence bulletin warning of a spike in threats to federal law enforcement officials since the search of former President Donald Trump'sTrump's Mar-a-Lago club in Florida, two senior law enforcement officials told NBC News.
The bulletin on Friday reads, "The FBI and DHS have seen an increase in threats to federal law enforcement and government officials, following the FBI's recent execution of a search warrant in Palm Beach, Florida.
The bulletin, which warns that such threats are coming from online and other platforms, was sent out of an abundance of caution, according to officials who spoke on condition of anonymity to discuss internal matters.
It calls for officials to be aware of issues surrounding domestic violent extremists, past and present incidents, as well as past behaviors, and to be vigilant, the officials said.
The FBI searched Trump's Mar-a-Lago resort on Monday. A senior government official told NBC News that the FBI was at the location for the majority of the day and that the search warrant was connected to the National Archives.
Pro-Trump internet forums erupted with violent threats and calls for civil war in the hours and days after the Mar-a-Lago search.
A man fired a nail gun into the FBI's Cincinnati field office is cited as one of the attacks on federal law enforcement, according to law enforcement officials.
The man, identified as Ricky Shiffer, died in a confrontation with police, according to two law enforcement sources. He appeared to have posted online about his desire to kill FBI agents shortly after the search.
A source familiar with the matter, who spoke on condition of anonymity, said Trump received a federal grand jury subpoena this past spring for sensitive documents that the government believed he retained after his departure from the White House.
The property receipt of items recovered by FBI agents who had searched Mar-a-Lago shows that agents recovered a trove of highly classified documents, according to court documents unveiled Friday by a federal judge in Florida.
The documents obtained by NBC News show that federal agents removed 11 sets of classified documents, including some that were labeled secret and top secret. The FBI took a handwritten note, information about the President of France, an executive granting of clemency for Roger Stone and binders of photos.
There were also papers described as SCI documents, which stood for highly classified sensitive compartmented information. The Justice Department filed a notice Friday saying Trump did not oppose the unsealing.
Three laws cited in the search warrant don't specify that the mishandled documents had to have been classified, while Trump and his allies have suggested that any documents in his possession had been declassified by him while he was in office.
Taylor Budowich, a Trump spokesman, called it an outrageous search and a botched raid, and dismissed details in the documents in a statement Friday.