Minneapolis officials said a crowd has gathered at the scene of a second shooting in a week in the city involving federal immigration officers.

Minneapolis Police Chief Brian O’Hara said the crowd amounted to an “unlawful assembly” and some people were throwing fireworks and rocks at officers.

“People need to leave. This is already a very tense situation and we do not need this to escalate any further,” O’Hara told reporters at a news conference Wednesday night.

The Department of Homeland Security said a federal law enforcement officer shot a man who they said fled a “targeted” traffic stop and then attacked the officer. DHS also said two other people assaulted the officer with a snow shovel and broom handle.

“There’s still a lot that we don’t know at this time,” Mayor Jacob Frey said. “But what I can tell you for certain is that this is not sustainable. This is an impossible situation that our city is being put in.”

ICE agents and Border Patrol are “creating chaos,” in the city, Frey said, adding, “I’ve seen conduct from ICE that is disgusting and is intolerable. If it were your city, it would be unacceptable there too.”

 The mayor called on residents to protest peacefully. 

 “And for anyone that is taking the bait tonight — stop,” he said. “That is not helpful. Go home. We cannot counter Donald Trump’s chaos with our own brand of chaos.”

The police chief said the Minnesota Bureau of Criminal Apprehension and the FBI are on the scene to investigate the shooting.

“Preliminary information indicates that there was a struggle with a federal agent” in front of a residence on 24th Avenue North, O’Hara said. “During the struggle, the federal agent discharged his weapon, striking one adult male.”

He said it was believed the man’s gunshot wound was not life-threatening.