Half of the victims were children younger than 16, and the youngest victim is 8 years old.
The Jackson County Family Court Division said that additional charges are expected as the police investigation continues.
But because the suspects are juveniles, they can be held for a longer time with a court order.
An injured person is loaded into an ambulance after the mass shooting at Kansas City Chiefs Super Bowl victory rally.Getty
Half of the victims were children younger than 16, and the youngest victim is 8 years old.
Kansas City police said Thursday that a dispute between several people led to the gunfire.
Nine of the injured are children, officials said later.
Kansas City Police Chief Stacey Graves said officers have three persons detained and under investigation.
Officials had said earlier that two armed suspects were in custody.
All of that is still actively being investigated.
Asked whether there was more than one shooting scene, Graves said: That is still an active thing.
That is a lot of ground to cover, as you know the size of Union Station.
I will tell you we have located that crime scene on the west side of Union Station.
As far as in the front of [the station], that is still under investigation.
We have crime-scene investigators as well as detectives.
I do not have conditions on our victims just yet, the chief added.
I do not believe that any of them were children.
The shooting followed the Kansas City Chiefs Valentines Day downtown parade and rally.
A local hospital is currently treating four gunshot victims and eight others non-gun injuries.
This is the 57th mass shooting in America in 2024 so far.
Two armed suspects have been taken into custody, Chief Graves confirmed.
Whether or not, that duo were involved in the shooting Wednesday remains unclear.
Officers were on scene in the area.
I know one of the suspects was immediately pursued on foot.
There are two suspects in custody.
We had more than 800 … officers at the scene.
Because of bad actors which we very few this tragedy occurred.
This is not Kansas City, both the police chief and Mayor Quinton Lucas exclaimed.
We are praying for the safety of everyone, the Mayor said.
Mayor Lucas added that he had heard from the White House offering all federal assistance in the investigation.
As the press conference was ongoing, the Biden administration put out a statement of its own.
Thousands of people went scrambling after multiple shots rang out around 2 p.m. local time.
Another update and press conference has been set for 3 p.m. PT.
