Developing.

Multiple police agencies are responding to a reported shooting at North Park Elementary School.

“We have a shooter down and three victims,” said Maria Garcia, a spokeswoman for San Bernardino City Unified. “One of them is a teacher, the other two are unknown, and their condition is unknown. We believe the situation is contained.”

Police agencies were in the process of clearing classrooms, according to radio traffic at 10:50 a.m.

SAN BERNARDINO: #SBCoFD on scene mult GSW victims at North Park School. Triage and victim count taking place. ^eas

— San Bernardino County Fire (@SBCOUNTYFIRE) April 10, 2017

There is a report of a shooting at Northpark Elementary. Large police response, please stay out of the area. More info to follow.

— Jarrod Burguan (@RetSBPDChief) April 10, 2017

Preliminary info is 4 victims, being treated. Suspect is possibly down as well.

— Jarrod Burguan (@RetSBPDChief) April 10, 2017

“We have a shooter down and three victims,” said Maria Garcia, a spokeswoman for San Bernardino City Unified. https://t.co/lUWrjJ0Wtn pic.twitter.com/9MKApWnh6s

— The Sun (@sbsun) April 10, 2017

Students evacuated at North Park Elem School in San Bernardino, CA following reports of classroom shooting; possibly murder/suicide @nbcla pic.twitter.com/CAhI29aJES

— Jesse Rodriguez (@JesseRodriguez) April 10, 2017

Update: The shooting appears to be a murder-suicide in which the suspect attacked and killed a teacher in a classroom, and then committed suicide. It is not yet known if the students were targeted, or if their injuries were even gunshot wounds. Both students have been transported to area hospitals. Scanner traffic suggests one student has a head wound, and the other has a chest wound, but is talking.

It will be very interesting to see what safety protocols the school had in place, and if they did, how the suspect defeated those protocols.

Update: Scanner traffic suggests the shooter was the husband of the victim.

Update: One of the young victims, an eight-year-old boy, has died. A second student remains in critical condition.

BREAKING: Police chief: 8-year-old student shot in San Bernardino classroom in murder-suicide has died.

— The Associated Press (@AP) April 10, 2017

Update: The adult female victim and the male murderer have been identified.

Victim in school shooting identified as Karen Smith, age 53, estranged wife of suspect. pic.twitter.com/IaC7RCtVhl

— San Bernardino PD (@SanBernardinoPD) April 10, 2017

Suspect in shooting identified as Cedric Anderson, age 53, resident of Riverside, CA. pic.twitter.com/H9YYQZvZud

— San Bernardino PD (@SanBernardinoPD) April 10, 2017