At least two dead, two wounded in Southern California school shooting
An apparent murder-suicide inside a California primary school classroom has left two adults dead, including a teacher, and two pupils wounded, officials said.
Officers do not believe the children were targeted but were close to the female teacher at North Park School, San Bernardino, when the suspect came to the classroom and opened fire with a handgun, Captain Ron Maass said at a news conference.
"There was no indication the gun was visible upon his arrival at the school," Mr Maass said.
The injured pupils were taken to hospital after what was believed to have been a domestic dispute, San Bernardino City Unified School District spokeswoman Maria Garcia told news station KNBC-TV.
Police would not confirm the adults' relationship or if it was a domestic dispute.
"We believe the teacher knew who the shooter was," Ms Garcia said, adding that all other pupils were safe.
Students gathered on a field and a basketball court inside the fenced-in grounds of the campus near a line of school buses. The school has about 600 students from nursery age through to Year 6.
Frantic parents running up a pavement looking for information about their children were not able to learn immediately what happened. Several parents interviewed on TV said their children were too young to carry mobile phones, so they had not been able to contact them to see if they were safe.
Marina Ramos told news station KABC-TV that she rushed to the school to try to pick up her grandson after she heard about the shooting. She said she spoke to him, and he told her he was safe but was upset.
"He was crying. He's scared," she said. "It was a typical morning and then chaos broke out."
Pupils were being taken to a local college campus, Ms Garcia said. Police told parents to go to a nearby high school to pick up their children.
The city of 216,000 was the site of a December 2015 terror attack that killed 14 people and wounded 22 others at a meeting of San Bernardino County employees.
Husband-and-wife shooters Syed Rizwan Farook and Tashfeen Malik were killed in a gun battle with authorities later that day.
The city is known for its high rate of violent crime, especially homicide, and has struggled to emerge from bankruptcy.