Minneapolis live updates: DOJ launches investigation into Pretti killing, Deputy AG Blanche says

Attorney General Pam Bondi said she is "on the ground" in Minneapolis and announced the arrest of 16 people charged with assaulting federal law enforcement.

"Federal agents have arrested 16 Minnesota rioters for allegedly assaulting federal law enforcement -- people who have been resisting and impeding our federal law enforcement agents," Bondi wrote on social media. "We expect more arrests to come. I've said it before and I'll say it again: NOTHING will stop President Trump and this Department of Justice from enforcing the law."

The two federal officers involved in Saturday's shooting of Alex Pretti have been placed on paid administrative leave, according to multiple sources familiar with the situation.

The sources stress this is standard operating procedure when there is an officer involved shooting.

The two federal officers involved in Saturday's shooting of Alex Pretti have been placed on paid administrative leave, according to multiple sources familiar with the situation.

One federal officer involved is a Border Patrol Agent and the other is a Customs and Border Protection officer, according to a DHS notification to Congress, obtained by ABC News on Tuesday. Both discharged their weapons, according to the notification.

Minnesota Gov. Tim Walz visited the memorial for Alex Pretti Wednesday morning.

Minnesota Gov. Tim Walz visited the memorial for Alex Pretti Wednesday morning, telling ABC News correspondent Matt Rivers, "We're just personally paying our respects, my wife and I."

When asked if he thinks there will be a shift in tone from the administration after his conversation with President Donald Trump, the governor replied, "I'm not so interested in shift in tone. We just need them out of here, and we need accountability for what's happened."

President Donald Trump said in a social media post that Minneapolis Mayor Jacob Frey is "playing with fire" after Frey said the city will not enforce federal immigration laws.

"Surprisingly, Mayor Jacob Frey just stated that, 'Minneapolis does not, and will not, enforce Federal Immigration Laws.' This is after having had a very good conversation with him," Trump wrote on social media. "Could somebody in his inner sanctum please explain that this statement is a very serious violation of the Law, and that he is PLAYING WITH FIRE!"

Frey said on social media on Monday that in his meeting with border czar Tom Homan, he "reiterated that my main ask is for Operation Metro Surge to end as quickly as possible."

"I shared with Mr. Homan the serious negative impacts this operation has had on Minneapolis and surrounding communities, as well as the strain it has placed on our local police officers," Frey said. "I also made it clear that Minneapolis does not and will not enforce federal immigration laws, and that we will remain focused on keeping our neighbors and streets safe. City leaders will continue to stay in conversation with Mr. Homan and his team."

-ABC News' Hannah Demissie