Barr said he had met other law enforcement officials on Monday and decided they needed to extend a security perimeter around the White House to protect federal agents "who could be reached by projectiles from the street". He expected the perimeter to be moved in the early afternoon, but when he arrived in the evening, shortly before Trump was to speak at a news conference, he learned it wasn't done and ordered law enforcement officials to take action.
After the crowd was dispersed, Trump, followed by an entourage of his most senior aides — including Barr — along with Secret Service agents and reporters, walked to St John's Church. The landmark pale-yellow building where every president, including Trump, has prayed, had been damaged Sunday night in a protest fire. Barr said Trump, as the nation's chief executive, had every right to do so and claimed it wasn't political.
"I don't necessarily view that as a political act. I think it was entirely appropriate for him to do," Barr said.
US Park Police launched an investigation after officers were seen hitting an Australian journalist with a shield as they cleared the protesters.
For days, the federal government has vowed to have an aggressive response in the District of Columbia after nights of violence that led to fires being set, windows shattered, store shelves emptied and dozens of police officers injured. The federal government has deployed law enforcement officials from numerous agencies, and National Guard troops from a number of states have been sent to the District of Columbia.
The Justice Department had deployed agents from every one of its agencies, including the FBI's Hostage Rescue Team, an elite tactical unit, and riot teams from the Bureau of Prisons.
The Park Police and Secret Service have had dozens of officers out in riot gear for the past few nights, in addition to the Metropolitan Police Department. US Customs and Border Protection and other Homeland Security agencies were also dispatched.
Members of Congress have raised concerns about a number of federal law enforcement officials in Washington who have refused to identify which agency they work for and stand, armed, without visible identification or badges. Some lawmakers have vowed to introduce legislation to require federal agents to identify themselves at protests.
"We are concerned about the increased militarisation and lack of clarity that may increase chaos," House Speaker Nancy Pelosi wrote in a letter to Trump on Thursday.
Some of the officers appeared to be assigned to Bureau of Prisons special response teams, which were dispatched to Washington and Miami. Some of those officers have said they were told to say only that they work for the federal government or the Department of Justice.
But Bureau of Prisons Director Michael Carvajal said that was untrue and no such directive had been given.
"I probably should have done a better job of marking them nationally as the agency, the point is well taken, but I can assure you that no one was specifically told, to my knowledge, not to identify themselves," he said.
Hundreds of other law enforcement officials have also been deployed to the streets of Washington.
They include more than 100 Drug Enforcement Administration agents who have been deployed to work alongside members of the National Guard at checkpoints that have been set up to help slow the numbers of vehicles coming into the area, which investigators suspect may be used to bring in projectiles to be thrown at police. Acting DEA Administrator Timothy Shea said they also serve a vital purpose by helping to relieve the Metropolitan Police Department so it can handle other emergencies.
On Wednesday night, Shea visited a handful of checkpoints throughout downtown Washington.
"They've been verbally assaulted at times. Earlier in the week there were bricks thrown at their vehicles, and they responded with restraint and they respected the rights of protesters but were also able to identify criminal activity that was happening," Shea said of his agents.
Most of the protesters have been peaceful and tried to discourage violence. Trump, Barr and others have tried to blame some of the civil unrest on left-wing extremist groups, including antifa, and other "anarchists". Short for anti-fascists, antifa is an umbrella term for far-left-leaning militant groups that resist neo-Nazis and white supremacists at demonstrations.
A senior Justice Department official said FBI intelligence shows antifa and other groups have been involved in some of the protests around the US. There have been "multiple instances" in which people who have been arrested have identified themselves to law enforcement as members of antifa, the official said. The official, who could not discuss ongoing investigations publicly and spoke on condition of anonymity, did not provide specific details.
Investigators also believe that groups have been training some demonstrators on techniques to rush officers on the lines of the protests and giving tips on how to avoid being arrested, the official said.
