Tetsuya Yamagami, 42, was indicted on murder charges as well as for violating gun laws after concluding a roughly six-month psychiatric evaluation.
Shinzo Abe, assassinated in July, was Japan’s longest serving leader but his views for a stronger military and what some call cronyism have been unpopular among a section of the population.
Man sets himself alight in Tokyo after telling police he is opposed to plans for a state funeral for assassinated ex-PM Shinzo Abe, local media report.
National Police Agency Chief Itaru Nakamura's announcement came as his agency released a report blaming flaws in police protection of former prime minister Shinzo Abe, who was shot and killed on July 8.
Approval ratings for Fumio Kishida's government fell 13 percentage points in three weeks as the public scrutinises its handling of the economy and the Unification Church's ties with politicians, a recent poll shows.
The ceremony will be only the second state funeral for a former prime minister in post-war Japan, after that of Shigeru Yoshida, who led the country following World War II.
Japan's Prime Minister Fumio Kishida urged the Japanese police "to fix what needs to be fixed" after photos and videos of the shooting showed the gunman was able to come very close to Shinzo Abe.
Family and friends of assassinated former prime minister Shinzo Abe gathered at a Tokyo temple for a private funeral as tributes have poured in from international leaders.
Police investigating the suspect accused of murdering the former prime minister say he targeted Abe because he believed the PM was linked to a particular group his mother made large donations to.
Japan's ruling party and partners win enough votes to form a supermajority in an upper house election held just days after the assassination of ex-PM Shinzo Abe
The outcome was widely expected in elections held after the fatal shooting of prominent ruling LDP member and power broker, former premier Shinzo Abe.
The election, which is expected to see Shinzo Abe's ruling Liberal Democratic Party increase its majority, has been overshadowed by the murder.
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