Two people were killed in a shooting at an elementary school in San Bernardino city of California on Monday, media reported.

San Bernardino Police Chief Jarrod Burguan said that four people were shot and the victims included a teacher and two students.

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Citing the fire officials NBC Los Angeles reported that it was not immediately clear whether the teacher and two students were among the deceased.

Fire officials confirmed that two people were dead. The shooter was "possibly down," said Chief Jarrod Burguan.

At least two students were among the wounded, the chief added.

Monica Garcia of the San Bernardino Unified School District said the shooting appeared to stem from a domestic violence dispute involving the injured teacher.

The school, North Park Elementary, remained under lockdown till late Monday morning. Details about the shooter were not immediately available.