Public prosecutors have indicted a man suspected of throwing an explosive device that landed near Prime Minister Kishida Fumio in April.
The Wakayama District Public Prosecutors Office indicted 24-year-old Kimura Ryuji on Wednesday.
Prosecutors allege that Kimura threw an explosive near Kishida at a fishing port in Wakayama City, western Japan, on April 15. Kishida was there to give an election campaign speech for a candidate in a Lower House by-election.
Two people were injured in the attack. Kimura was arrested on the spot.
Police say the explosive was a pipe bomb. They say investigations confirmed that the bomb was capable of killing or injuring people.
Prosecutors determined that Kimura can be held criminally responsible after experts conducted a psychiatric evaluation on him for about three months.
Kimura has been indicted on five charges, including the attempted murder of Kishida and others, and violations of the explosives control and public offices election laws.
He has reportedly remained silent since his arrest.