San Diego Mosque Shooter Cain Clark's Sickening Suicide Note 'About Racial Pride' Revealed Hours After Teen Opened Fire and Killed Three People

Cain Clark, 17, and Caleb Vazquez, 18, attacked the Islamic center around 11:40am on Monday, after stealing guns and a car from the home of Clark's mother. Hours later, police revealed a search of Clark's home, around two miles from the mosque, uncovered a suicide note "writing about racial pride."

The BMW X1, in which the two shooters died, was photographed with a gas can emblazoned with a Nazi SS sticker on its side.

Clark had been a star wrestler at Madison High School, but after officials said he had become consumed by "hate speech," and began taking classes purely online. He was set to graduate from virtual high school this semester.

San Diego Police Chief Scott Wahl told reporters Monday, "We are considering this a hate crime until it’s not."

According to police, Clark's mother warned them that her son had stolen her car, and was potentially armed with her weapons.

She also said he and another teen were dressed in camouflage, and described her son as "suicidal."

Authorities immediately launched a widespread search for the pair, and used automated license plate reading technology to track a vehicle associated with them to the Fashion Valley area, which is where they were when someone called 911 to report a shooter, Wahl said.

There was no specific threat made against the Islamic center, but authorities found evidence the suspects engaged in "generalized hate rhetoric."

"It was just general hate kind of speech that I think covered a wide gamut," said Wahl.

Police have not yet released the names of the victims. But a family friend identified one as Amin Abdullah, a security guard whom Wahl said "played a pivotal role" in preventing the attack from being more deadly.

One witness told The New York Times she watched in horror as the security guard was struck by at least two gunshots while children playing outside were herded into the building. No students were harmed in the attack, and aerial TV footage showed the school children holding hands as they were led out of the parking lot surrounded by police vehicles.

"It's fair to say his actions were heroic," Wahl said of the guard. "Undoubtedly, he saved lives today."

In a statement, the center called him "a courageous man who put himself on the line of the safety of others, who even in his last moments did not stop protecting our community."

The circumstances surrounding the shootings, as well as the motive in the case, are still under investigation. The center, which said it was closed until further notice, is the largest mosque in San Diego and typically holds five daily prayers.

While authorities and police sources have revealed some details of Clark, little is known about Vazquez. However, in an online message, the center was only interested in honoring and remembering the victims.

"These were men who put themselves on the line for our masjid and our community," the center wrote in a Facebook post, using the Arabic word for mosque. "Men of courage, sacrifice, and faith. Their absence leaves a void that can never truly be filled."