In Dallas, 11 people were shot, one of them fatally.
At least three young people were hurt in the shooting, police say.
Twelve people were shot in Dallas early Sunday, one of them fatally, police say.
Three of the victims are under the age of 18, according to the Dallas Police Department.
At least six people were killed and at least 10 others were injured when a mass shooting took place in the middle of downtown Sacramento, California. This happened several hours before.
Investigators are trying to figure out who or what caused the shooting at a concert in Dallas on Saturday night. No one had been arrested as of Sunday afternoon.

There was a shooting at the event, and one person fired a gun into the air. Then, “an unknown person fired a gun in our direction,” said the Dallas Police Department in a statement.
The person who died was named by police as 26-year-old Kealon Dejuane Gilmore, who was killed. A police report says Gilmore was found dead near the stage with a gunshot wound to the head.
Eleven more people were hurt in the shooting and taken to the hospital in private cars. An injured person was in critical condition, police said. The other people were in stable condition, they said.
During an event in south Dallas, someone opened fire around 12:13am and killed two people. Police say the shooting happened at an event called a trail ride and a show.
Police said in a statement that when they arrived, they found out that multiple people had been shot while at a concert.
Big Boogie, a rapper from Memphis, Tennessee, was supposed to be the headliner of the show. There was a shooting at the show. ABC affiliate station WFAA in Dallas says the shooting happened before Big Boogie got there. A notice on the entertainer’s Instagram page said that.
If you want to go to an outdoor show, a flyer said the gates would open at noon on Saturday. It said horses and ATVs were welcome, too. In the flier, it said that children under the age of 10 would be free to come in.
People who organized the event said that they were “not responsible for accidents or theft.”
It was a “jam-packed” event with many people, a witness told WFAA. Concert-goers ran for cover, preventing the police and emergency vehicles from quickly entering the scene to help people who had been hurt.
Police say the investigation is still going on, but they don’t know what happened.
People who give information that leads to the arrest and indictment of the people who did this will get up to $5,000 from Crime Stoppers, police say.