MINNEAPOLIS (AP) — A federal immigration operation in Minneapolis turned deadly this week when a U.S. Immigration and Customs Enforcement officer shot and killed 37-year-old Renee Good during a confrontation involving her vehicle.

Cellphone video captured the shooting, which federal officials claimed was an act of self-defense but that the city’s mayor described as “reckless” and unnecessary. Video shows an ICE officer approaching Good’s SUV stopped in the road as the vehicle begins to move forward. Another ICE officer standing in front of it draws his gun and fires at close range as he jumps out of the way.

Here’s what to know about regulations on using deadly force in these situations:

When can officers fire at a moving vehicle?

There is no universal training standard for law enforcement. But most police departments and federal guidance bar shooting at a moving vehicle unless the driver poses an imminent threat of deadly force beyond the car itself.

Why are shootings at vehicles restricted?

Experts say firing at a moving car is one of the riskiest forms of lethal force, increasing the chance of stray gunfire or a loss of vehicle control that can endanger bystanders.

Are officers expected to move out of the way?

Yes. Justice Department policy says deadly force is allowed only when no reasonable alternative exists, including stepping out of the vehicle’s path.

Can officers use deadly force just to stop or arrest someone?

No. Policies generally state officers cannot use deadly force solely to arrest someone or to disable a fleeing vehicle if the person does not pose an immediate threat.

Do federal immigration agents follow different rules?

Not fundamentally. ICE and other federal officers operate under similar Justice Department guidance limiting gunfire at vehicles, although federal agents have added legal protections when acting within their official duties.

What is ICE’s policy?

The Department of Homeland Security, which oversees ICE, allows deadly force only when an officer reasonably believes someone poses an imminent threat of death or serious injury.

Who investigates these shootings?

Federal agencies conduct internal reviews, and state and local authorities may also pursue criminal investigations. Federal agents are not immune from prosecution if they act outside their authority. The FBI is leading the investigation into the Minneapolis shooting.