LAGUNA WOODS, Calif. (AP) — A Chinese-born gunman motivated by hatred against Taiwan chained shut the doors of a California church and hid firebombs before opening fire on a gathering of mainly of elderly Taiwanese parishioners, killing a man who tackled him to save possibly dozens of lives, authorities said Monday.

David Chou, 68, of Las Vegas drove to Orange County on Saturday and the next day attended a lunch held by Irvine Taiwanese Presbyterian Church, which worships at Geneva Presbyterian Church in the community of Laguna Woods. Though he knew no one there, he spent about an hour mingling with about 40 attendees and executed his plot, authorities said at a news conference.

He chained the doors and used super glue on the locks. He had two 9mm handguns and two bags — one with four Molotov-cocktail-type incendiary devices and the other with extra ammunition. He opened fire and in the ensuing chaos Dr. John Cheng, 52, tackled him and then other parishioners were able to subdue him and tie him up with extension cords.

Cheng died and five people were wounded, the oldest 92. Sheriff Don Barnes called Cheng’s heroism “a meeting of good versus evil” that probably saved the lives “of upwards of dozens of people.”

Chou was booked on suspicion of murder and attempted murder and jailed on $1 million bail. He was expected to appear in state court Tuesday. It was not immediately clear whether he had an attorney who could speak on his behalf. A federal hate crimes investigation is also ongoing.

There was no immediate word on why Chou chose to target the church in Laguna Woods, a scenic coastal area whose population mainly consists of retirees and is near a large gated community.

Barnes said the motive of the shooting was a grievance between the shooter, who he said was born in China and is a U.S. citizen, and the Taiwanese community. China claims Taiwan is a part of its national territory and has not ruled out force to bring the island under its rule.

Barnes said Chou acted alone and was not a regular attendee of the church.

“He is not believed to be associated with any specific church or any religion, and there’s no direct connection to the church or any member of the church that we’re aware of,” Barnes said.

A former neighbor said Chou’s life unraveled after his wife left him. Chou had been a pleasant man who used to own the Las Vegas apartment building where he lived until February, Balmore Orellana told The Associated Press. Records showed the four-unit property was sold last October for a little more than $500,000.

Orellana said Chou’s wife used the money from the sale to move to Taiwan.

Before Orellana moved in about five years ago, Chou received a head injury and other serious injuries in an attack by a tenant, the neighbor said. More recently his mental health declined and last summer a gun was fired inside Chou’s apartment and the bullet entered Orellana’s apartment, although nobody was hurt, Orellana said.

Police reports about the assault and the shooting were not immediately available Monday.

Chou’s family apparently was among many forcibly removed from China to Taiwan sometime after 1948, Orange County District Attorney Todd Spitzer said. Chou’s hatred toward the island, documented in hand-written notes that authorities found, seems like it began when he felt he wasn’t treated well while living there.

Tensions between China and Taiwan are at the highest in decades, with Beijing stepping up its military harassment by flying fighter jets toward the self-governing island. China has not ruled out force to reunify with Taiwan, which split from the mainland during a civil war in 1949.

Taiwan’s chief representative in the U.S., Bi-khim Hsiao, offered condolences to the families on Twitter.

“I join the families of the victims and Taiwanese American communities in grief and pray for the speedy recovery of the wounded survivors,” Hsiao wrote on Sunday.

Chinese Embassy spokesperson Liu Pengyu told the AP via email that the Chinese government has “consistently condemned incidents of violence. We express our condolences to the victims and sincere sympathy to the bereaved families and the injured.”

At the California church, the shooting erupted after Jerry Chen had just stepped into the kitchen of the church’s fellowship hall around 1:30 p.m. Sunday.

Chen, 72, a longtime member of the Irvine Taiwanese Presbyterian Church, peeked around the corner and saw others screaming, running and ducking under tables.

“I knew someone was shooting,” he said. “I was very, very scared. I ran out the kitchen door to call 911. ”

Samuel Nganga, a member of Geneva and a caretaker for the church, said he was starting to clean up in the kitchen when he heard the shots. He and others crawled out on their hands and knees to escape.

Those wounded by gunshots included four men, ages 66, 75, 82 and 92, and an 86-year-old woman, the sheriff’s department said. Four suffered gunshot injuries. Authorities on Monday said two of the wounded were in good condition, two were in stable condition and the status of the fifth patient was undetermined.

Chen said a group of about 40 congregants had gathered in the fellowship hall for a luncheon after a morning service to welcome their former Pastor Billy Chang, a beloved and respected community member who had served the church for 20 years. Chang moved back to Taiwan two years ago. This was his first time back stateside, Chen said.

Everyone had just finished lunch and were taking photos with Chang when Chen went into the kitchen, he said. That’s when he heard the gunshots.

Barnes said Cheng, a sports medicine doctor who is survived by a wife and two children, charged at the shooter and attempted to disarm him, allowing others to intervene. Chang hit the gunman on the head with a chair before other parishioners subdued him.

“I will tell you that evil was in that church,” Spitzer said, who added that Chou had “an absolute bias” against Taiwan and its people.

The shooting came a day after an 18-year-old man shot and killed 10 people at a supermarket in Buffalo, New York in a racist rampage where the white gunman allegedly targeted a supermarket in a predominantly Black neighborhood.

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