According to officials, on Monday, a gunman shot his estranged wife, a teacher, inside an elementary school classroom in San Bernardino, California. He killed her and one of her students before killing himself.

Murder suicide:

Cedrick Anderson, the identified suspect, entered the classroom and fatally shot his wife, Karen Smith, without uttering a word.

He also struck two students who were standing behind Smith. 8 year old Jonathan Martinez later died at a nearby hospital, while the other 9 year old student who was not identified was hospitalized in stable condition Monday afternoon, as per Police Chief Jarrod Burguan.

The North Park School classroom was for special-needs students.

Burguan said that 53 year old Anderson and Smith were separated. Police Capt. Ron Maass said at a news conference that they do not believe any of the 15 children in the classroom were specifically targeted.

Maass told reporters that “there was no indication the gun was visible upon his arrival at the school.” Burguan added that Anderson had told the school he had come to drop something off for Smith.

Anderson’s criminal background, which is currently being looked into by authorities, includes domestic violence and weapons charges. Burguan said that they found a .357 next to his body, they believe he fired six rounds before reloading.

Burguan added that at around 10:30 a.m. local time, Anderson entered the classroom and “very, very quickly” opened fire. Shortly afterwards, police declared that the “current threat at North Park ES has been neutralized”.

A neighbor, who was visibly shaken, said to NBC News that she noticed something was off when she “noticed helicopters circling.”

The woman asked to not be identified, she added: “I realized there were two, and I looked outside and the kids were being evacuated up our street.”

She added that several children were crying and holding their teachers’ hands.

Previous mass shooting:

In December 2015, the nation’s worst mass shooting occurred in San Bernardino when Syed Rizwan Farook and Tashfeen Malik went into a county health department Christmas Party and opened fire, killing 14 people and wounding 22 others. They were later killed by police.