"The San Bernardino Fire Department wrote as the shooting news broke: "#SBCoFD on scene mult GSW victims at North Park School.
Two children, including Martinez, were struck by gunfire behind Smith in the apparent murder-suicide shooting, according to police.
There was a shooting at North Park Elementary school in San Bernardino this morning.
San Bernardino County Police Chief Jarrod Burguan said in a tweet that two students have been transported to the local hospital.
San Bernardino City Unified School District will release a statement shortly.
On 2 December 2015, fourteen people were killed and 22 more injured at a holiday party at San Bernardino's Inland Regional Center. A 9-year-old classmate was admitted to pediatric surgery at a local hospital, where he was said to be in stable condition. Two students were injured.
San Bernardino police have confirmed that the situation is "contained", which means that students, teachers or staff are no longer in any immediate danger.
A nearby California state university has ordered a shelter-in-place, and firefighters have created a triage area to access and treat the wounded, NBC Southern California reported. CNN affiliate KABC showed footage of school buses that were being used to take students to Cajon High. "However, we do believe the threat is down". According to police, there are four victims involved, two adults and two children. Police Chief Jarrod Burguan, who won national praise for the way his department responded to the 2015 shootings, announced a year ago he was hiring additional officers.
In total, two people including the teacher and gunman are dead.
Sherwin says numerous firefighters and police officers are headed to the scene.
Frantic parents ran up a pavement looking for information about their children but were not able to learn immediately what happened at the school.