The FBI and NYPD are investigating a letter containing a death threat and white powder that was mailed to Manhattan District Attorney Alvin Bragg, whose office is investigating former President Donald Trump, law enforcement sources told NBC. News.

The letter was addressed to Bragg and read: «ALVIN: WOW! The sources said. It contained a small amount of white powder.

There were no evacuations or injuries, authorities said.

In a statement, the prosecutor’s office said the letter «was immediately contained and determined to be free of any hazardous substances by the NYPD Emergency Services Unit and the New York City Department of Environmental Protection.»

New York Police Department officers outside Manhattan District Attorney Alvin Bragg’s office in New York on Friday.Yuki Iwamura/Bloomberg via Getty Images

Markings on the envelope indicate it was shipped from Orlando, Florida earlier this week, the sources said. He was postmarked Tuesday, the sources said.

The letter comes after Trump falsely announced that he would be arrested in the investigation last Tuesday and that people should «protest.» His rhetoric has grown more heated in the days since, including warning him on his social media website early Friday of «potential death and destruction» if the prosecutor indicts him.

An indictment in the case could be filed as soon as next week, as there are indications that the investigation is in its final stages. NBC News reported last week that law enforcement officials had already begun preparing security precautions in the event of a possible prosecution in discussions that include the NYPD, New York State court officials , the US Secret Service, the FBI’s Joint Terrorism Task Force, and the prosecutor’s office. .