The memo was dated Jan. 28 and signed by by Acting Director Todd Lyons.
A 37-year-old man was shot and killed Saturday morning in Minneapolis -- the second shooting of a U.S. citizen this month by federal agents in the city.
The shooting of Alex Pretti, an ICU nurse, ratcheted up tensions, as protesters clashed in the streets with law enforcement in the aftermath of the shooting.
The incident followed the fatal shooting of Renee Good, a 37-year-old mother, on Jan. 7.
The NBA announced Saturday that the matchup between the Golden State Warriors and the Minnesota Timberwolves, which was scheduled to take place at the Target Center in Minneapolis, was postponed to Sunday.
"The decision was made to prioritize the safety and security of the Minneapolis community," the league said in a statement.
The Hennepin County District Attorney's Office launched a website that allows anyone with evidence for Saturday's shooting, including video, to submit it to local investigators.
The site is also being used to collect evidence for Renee Good's shooting.
Border Patrol Commander at Large Greg Bovino held a brief news conference around 1 p.m. local time and reiterated the details about the shooting DHS had previously provided.
The Border Patrol commander alleged a Border Patrol agent shot the 37-year-old man after he allegedly approached border patrol agents with a 9mm semi-automatic handgun, and "violently resisted" when agents tried to disarm him.
"This looks like a situation where an individual wanted to do maximum damage and massacre law enforcement," Bovino alleged.
When asked by reporters if the man ever brandished a weapon, Bovino responded, "This situation is evolving. The investigation is ongoing. Those facts will come to light."
Minneapolis police have said they believe the man was a licensed gun owner.
When another reporter asked Bovino when the man allegedly pulled out the weapon and other details of the confrontation, Bovino repeated his answer.
Commissioner of the Minnesota Department of Public Safety Bob Jacobson told reporters that there were no BCA or public safety agents at the crime scene.
Jacobson said that DHS pulled out of the scene leaving it to local law enforcement.
"We did not have enough resources to be able to hold that ground safely, and we had to leave that scene, because of the number of people available and the safety of those in the public and the safety of our teams " he said.
Jacobson said the BCA is engaged and involved but would not provide more details.
"They killed a man, created chaos …. and then we're left to clean up," Walz later added.
