The family of a woman who was killed by an immigration agent in Minneapolis has announced two lawsuits against the US government and members of the Trump administration.

Renee Good, a US citizen, was shot to death by an Immigration and Customs Enforcement (ICE) officer during a major immigration sweep in January. Millions watched the video recorded of her killing and residents of the Minnesota city took to the streets to protest.

One lawsuit blames the government for her death, claiming the operation created "an unprecedented environment for state-sponsored violence", a lawyer for the family said.

A White House spokeswoman in a statement called the lawsuits "baseless".

The lawsuits were brought by Good's brother, Brent Ganger, and her partner, Becca Good.

Speaking publicly for the first time since the shooting, Becca Good told a news conference on the lawsuits on Thursday: "The whole world had to watch as our entire universe was destroyed."

"We were all robbed," she said as she described how the shooting affected their three children.

In one of the lawsuits, the family accuses the government of "battery, assault, false imprisonment, intentional infliction of emotional distress and negligence that caused Renee's death", according to the family's lawyer.

It cites the Federal Tort Claims Act, which allows citizens to sue the government for personal injury, death or property damage caused by the negligence of federal employees.

The second lawsuit targets ICE officer Jonathan Ross, who shot Good, as well as White House Deputy Chief of Staff Stephen Miller, former Homeland Security Secretary Kristi Noem, White House border tsar Tom Homan and others, alleging a "conspiracy to interfere with civil rights by senior federal officials, federal immigration enforcement agents and private actors".

"Our government has become a grave and mortal threat to its own citizens," the family's lawyer, Antonio Romanucci told Thursday's news conference.