The man arrested for the assassination of Japan's former Prime Minister Shinzo Abe told police that he was angry with the leader of the religious group.
Yamagami said his mother went bankrupt after making a huge donation to the Unification Church.
The suspect believed that the former prime minister was affiliated with the Unification Church and intended to kill him.
Yamagami said that he resented his mother getting wrapped up in a religious group.
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Yamagami's mother is a member of the Japanese branch of the Unification Church. Yamagami and Abe were not part of the group.
The suspect's mother went bankrupt after becoming a member of the church. She was a member of the church for two to three years. She has been going to church meetings once a month for the past six months.
He denied that the church forced the suspect's mother to give money, and refused to say how much the suspect's mother donated.
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Police said they found bullet holes at a facility run by the church. The day before Abe was killed, Yamagami admitted to firing practice rounds, according to reports.
The police seized several guns from Yamagami. A homemade gun that was 16 inches long and 7 inches wide was reportedly used to shoot Abe.
The Unification Church said it did not have a direct relationship with the former Japanese leader.
The teen suspects were arrested after the 89-year-old woman was set on fire.
Abe spoke at an event hosted by the Unification Church. The U.S. is said to be involved in the event. He praised the organization for its focus and emphasis on family values. Other affiliates of the church have been drawing in Japanese politicians to their events.
The Unification Church was founded in South Korea in 1954.
The church opened a branch in Japan in the late 1950s. Right-wing politicians in Japan, such as Abe's grandfather, have common cause with the church.
The meeting was interrupted by a man with a gun.
In Japan, around 600,000 people are members of the church and have helped it make billions of dollars. Before his death, Moon helped to create a multi-billion dollar corporate empire with ventures such as the Washington Times and the New Yorker Hotel.
Critics and former members of the church have accused the church of being a cult, but the church has denied previous accusations.
Yamagami's background and motives are being investigated at the moment.
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