A powdery substance was found Friday with a threatening letter in a mailroom at the Manhattan Dist office. attentive Alvin Bragg, the latest security indictment as prosecutors weigh a possible historic charge against former President Trump, authorities said.

New York City police and environmental protection officials isolated and disposed of the suspicious letter, and tests showed there was no hazardous substance, Bragg spokesperson Danielle Filson said. The substance was sent to a lab for further testing, police said.

Alvin, I’m going to kill you, the letter said, according to a person familiar with the case. The person was not authorized to speak publicly about an ongoing investigation and did so on condition of anonymity.

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The discovery, in the same building where a grand jury is expected to resume work Monday, came amid increasingly hostile rhetoric from Trump, who is holding the first official rally of his 2024 presidential campaign in Waco, Texas, on Saturday.

Hours earlier, Trump posted on his social media platform that any criminal charges against him could result in possible death and destruction.

Trump also posted a photo of himself with a baseball bat next to a photo of Bragg, a Democrat. On Thursday, Trump referred to Bragg, Manhattan’s first black district attorney, as an animal.

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The building where the letter was found was not evacuated and business continued for the most part as usual, with prosecutors coming and going and bicycle delivery men delivering lunch orders. The building houses several government offices, including the city’s marriage bureau.

Security has been heavy around the courthouses and district attorney’s office in recent days as the grand jury investigates alleged hush money paid on Trump’s behalf during his 2016 campaign.

Extra police officers are patrolling, metal barricades have been placed along the sidewalks and bomb-sniffing dogs regularly sweep the buildings, which have also had to deal with unfounded bomb threats in recent days.

After Trump called on people to protest his possible arrest, Bragg sent a memo telling his staff: We will not tolerate attempts to intimidate our office or threaten the rule of law in New York.

The grand jury, convened by Bragg in January, has investigated Trump’s involvement in a $130,000 payment in 2016 to porn actor Stormy Daniels to prevent her from going public about a sexual encounter she said she had with Trump years earlier. have had. Trump has rejected the claim.