North Park Elementary School is just nine miles from the Inland Regional Center where 14 were killed and 22 were injured in the 2015 San Bernardino terrorist attack.
One young student, reunited with her mother, told local NBC News affiliate KNBC-TV that Monday's ordeal left her "super scared". Police were searching the man's house on Monday afternoon.
"Tragedy has again befallen our city", said Lt. Mike Madden during a press conference soon after the shooting.
Multiple victims are being treated for gunshot wounds at a school in San Bernardino, California, according to local officials.
The shooting happened in a classroom at North Park Elementary School at around 11 a.m. "We do not know the grade that the teacher taught", she said.
The relieved parents craned their necks scanning for their son's blue and white striped T-shirt. During the day, the school office is the single point of entry, she said.
San Bernardino City Unified School District Superintendent Dale Marsden called the incident "An absolute tragic event. It's a bad incident". Burguan asked for patience from family members as the process could take up to three hours.
Checkers, glow sticks blocks & good movie for evavuated students from Northpark Elementary.
Officers are evacuating students from the school, escorting them to Cal State. However, Burguan said police believe the suspect "is down" and that there is "no further threat". The gunman then turned the gun, which authorities said was a handgun, on himself.
Police killed them a shootout after a vehicle chase. A helicopter landed on campus to treat victims, Garcia said.
The shooting comes as San Bernardino has seen a major increase in violence.
"I believe that my kids are safe", she said.