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A top police official has acknowledged possible security lapses that allowed an assassin to fire his gun into former Japanese Prime Minister Shinzo Abe while he was addressing a campaign rally, raising questions how could the attacker get so close behind him.
The attacker, Tetsuya Yamagami, told investigators he acted because he believed rumours that Abe was connected to an organisation that he resents, police said.
Japanese media reported that the man had developed hatred toward a religious group that his mother was obsessed about and that caused his family financial problems. The reports did not specify the group.
On Saturday, a black hearse carrying Abe's body and accompanied by his wife, Akie, arrived at his home in Tokyo's upscale residential area of Shibuya. Many mourners, including top party officials, waited for his remains and lowered their heads as the vehicle passed.
Nara prefectural police chief Tomoaki Onizuka said Abe's assassination was his "greatest regret" in a 27-year career. "I cannot deny there were problems with our security," Onizuka said.
"Whether it was a set-up, emergency response, or ability of individuals, we still have to find out. Overall, there was a problem and we will review it from every perspective."
Abe's assassination ahead of Sunday's parliamentary election shocked the nation and raised questions over whether security for the former prime minister was adequate.
Some observers who watched videos of the attack noted a lack of attention in the open space behind Abe as he spoke.
A former Kyoto prefectural police investigator, Fumikazu Higuchi, said the footage suggested security was sparse at the event and insufficient for a former prime minister.
"It is necessary to investigate why security allowed Yamagami to freely move and go behind Mr Abe," Higuchi told a Nippon TV talk show.
Experts also said Abe was more vulnerable standing on the ground level, instead of atop a campaign vehicle, which is usually the case but was reportedly unavailable due to his hastily arranged visit to Nara.
"Looks like police were mainly focusing on frontward, while paying little attention to what's behind Mr Abe, and nobody stopped the suspect approaching him," said Mitsuru Fukuda, a crisis management professor at Nihon University.
"Clearly there were problems."
Fukuda said that election campaigns provide a chance for voters and politicians to interact because "political terrorism" was extremely rare in postwar Japan.
But Abe's assassination could prompt stricter security at crowded events like campaigns, sports games and others.
A look at high-profile political assassinations this century
During a parliamentary debate in 2015, Abe resisted suggestions by an opposition lawmaker to beef up his security, insisting that "Japan is a safe country."