SAN BERNARDINO >> Less than 18 months after San Bernardino was hit by a terrorist attack, a Redlands cop who helped take down those attackers called for increased gun control after a teacher was gunned down and two children critically wounded Monday in a murder-suicide at an elementary school across town.

North Park Elementary School student Jonathan Martinez, 8, later died. Teacher Karen Elaine Smith, 53, was fatally shot by her estranged husband, Cedric Anderson of Riverside, who committed suicide, San Bernardino police said at a Monday afternoon press conference.

• Read more: 2 adults, 1 student dead, 1 student wounded in San Bernardino school shooting

A survivor of the Dec. 2, 2015, Inland Regional Center attack that killed 14 people in San Bernardino wondered if police or armed security guards should stand watch at every school and if elementary schools now need metal detectors.

Dec. 2 survivor Hal Houser said when he learned about the school shooting Monday morning, he felt “almost remorse” because people don’t seem to be learning from all the terrorist attacks and mass shootings carried out in the United States and around the world.

“When are we going to wake up?” he said. “The world is not taking this seriously yet.”

• Photos: Three dead at North Park Elementary

Redlands Sgt. Andy Capps, who took part in the Dec. 2 shootout that killed the suspects after they fired at him and other pursuing police, said his first reaction was to be glad the school shooting wasn’t any worse than what had then been reported — that two adults were dead and two children injured.

Yet that reaction, he said, was “a sad state of affairs” because we’ve been conditioned to expect these attacks, he added.

The school shooting also left Dec. 2 survivors feeling anxious. Survivors Sally Cardinale and Ray Britain said they felt nervous after hearing about the brutality.

Within minutes of getting a text about the attack, Cardinale, 36, said she was leaving to check on her kids at their Redlands school — which she expected to be on lockdown.

“My heart just goes out to the victims,” said Britain, 48. “I think we have a higher level of empathy and understanding for all the victims and what they’re going through.”

Both deadly attacks in San Bernardino were shootings. The Dec. 2 attack left 57 survivors, with 22 shot. Martinez and an unidentified 9-year-old boy were critically injured at the school Monday. Martinez was flown to Loma Linda University Medical Center, where he died.

Capps decried the way gun violence has become an “established part of society.”

“The common denominator, clearly, is guns and gun violence,” he said. “Hopefully, our lawmakers will do whatever they can to make us all safer.”

Shortly before picking up his 15-year-old twins from school, Houser said his first suspicion was that Monday’s bloodshed might be another “crazed terrorist shooting” by people attacking “our most precious resource” — children at schools.

“If the terrorists wanted to strike fear into our hearts, that’s where they would hit,” he said.

Then Houser learned from his wife, who works as a San Bernardino County prosecutor, that it appeared to be a murder-suicide.

“For some reason men — and it always seems to be men — can’t let go of a woman that says, ‘No,’” he said. “Sounds like she made the right choice to leave this guy.”

Houser thinks California should divert bullet train funds to anti-terrorism programs and that the time may have come to have police or armed security at schools.

“I don’t want to see them there, but maybe it’s necessary,” he said.