Police in major US cities are preparing for potential unrest in case ex-President Donald Trump is arrested this week as part of a hush-money inquiry.
Authorities in New York, Washington DC and Los Angeles are ramping up their law enforcement presence.
A Manhattan prosecutor may charge Mr Trump over how he declared a payment to a porn star to keep quiet about an alleged affair.
It would be the first criminal case brought against a former US president.
Steel barricades were being erected on Monday outside the Manhattan Criminal Court, where Mr Trump could be charged, fingerprinted and photographed if charges are filed this week, as US media widely anticipate.
Increased police presence has also been seen outside Trump Tower in the city.
Every member of the New York Police Department (NYPD), including plainclothes detectives, has been ordered to wear their full uniform on Tuesday and is being placed on standby to mobilise, a police source told CBS, the BBC’s US partner.
The NYPD and the FBI’s Joint Terrorism Task Force have been in touch with the US Secret Service, whose job it is to protect presidents and former presidents, about how a potential arrest might take place.
Why is Trump under investigation?
The grand jury has been set up by Mr Bragg to determine whether there is enough evidence to indict Mr Trump.
The Stormy Daniels case centres on how Mr Trump reimbursed his former lawyer, Michael Cohen, after he paid Ms Daniels $130,000 to keep quiet ahead of the 2016 presidential election about an alleged affair years earlier with Mr Trump. The former president has denied any such relationship with Ms Daniels.
The record for the payment reimbursing Mr Cohen says it was for “legal fees”.
Prosecutors could argue this amounts to Mr Trump falsifying business records. That is a misdemeanour in New York, though it could be upgraded to a felony, a more serious case, legal analysts say.
The Secret Service agents assigned to protect Mr Trump will stay with him during any arrest, reports NBC.
