A neighbor of one of the teenage killers whose shooting rampage left three people dead at a San Diego Islamic center described a chilling encounter with the suspect a day before the heinous attack.

Jennifer Du, who lives across the street from Cain Clark, recalled seeing the 17-year-old on Sunday — a day before he and 18-year-old Caleb Vazquez opened fire at the Islamic Center of San Diego, killing three before turning the gun on themselves.

“It’s been unreal. I saw him literally the day before. He just stood there,” Du, 30, told The California Post.

“I didn’t know if he was watching me or something, but he just got food delivery and went back in.”

An aerial view of the house where one of the alleged gunmen in the attack at the Islamic Center of San Diego lives, showing a blue truck parked in the driveway and various plants in the front yard.
A neighbor of one of the teenage killers described a chilling encounter with the shooter a day before the heinous attack on the mosque.California Post
Clark’s next door neighbor described his family as normal, noting that the teen practiced martial arts and that she say him in a karate outfit.

“As far as we knew he was very nice. They were a nice family,” said the neighbor, Marne, 85, who declined to provide her last name.

“We were just flabbergasted,” she added of finding out about the attack. “We thought, ‘Oh my god,’ we couldn’t believe it. Just flabbergasted.”

Clark and Vazquez gunned down three people on Monday, including security guard and father of eight Amin Abdullah, who police say prevented more deaths. Two others members of the mosque, Nader Awad and Mansoor Kazziha, were named as victims of the shooting.

At least one of the suspects took a weapon from his parents’ home and left a suicide note that talked about racial pride, a law enforcement source told The Post.

Former high school wrestler Cain Clark posing with a plaque and medal.
Neighbors described the Clarks as a normal family and the street they live on as quiet.Instagram/madison.warhawk.wrestling
The shooters co-authored a manifesto featuring the same Nazi imagery Clark donned in a livestream video of the horrific attack.

After the shooting, the livestream showed Clark shoot Vazquez twice in the head before turning the gun on himself.

Anti-Islamic writings were also found in the suspects’ vehicle, according to a law enforcement source.

Aerial view of police responding to a shooting at the Islamic Center of San Diego.
The teens’ killers gunned down three people on MondayNBC
The shooters’ motivations are unknown, though it appears to be a crime aimed at the Muslim faith.

Elizabeth Aderhold, who lives across the street from the Islamic, said that it beefed up its security after the Israel-Gaza conflict broke out, and for a while city cops would come to provide security.

“It’s a pretty safe neighborhood. We never had a problem before,” Aderhold said. “The craziest thing that happened is a garbage truck fire.”

SOURCE: https://nypost.com/2026/05/19/us-news/cain-clarks-neighbor-reveals-haunting-encounter-with-san-diego-mosque-shooter-day-before-deadly-rampage/