Japanese Prime Minister Fumio Kishida resumed campaigning on Saturday after being evacuated unharmed from the scene of an apparent "smoke bomb" blast.
The incident in western Japan's Wakayama came less than a year after the assassination of former prime minister Shinzo Abe, which traumatised the country and forced a security shake-up for public officials.
Kishida was in the city to deliver remarks in support of a ruling party candidate and had just finished sampling fish at a local port when a disturbance rippled through the crowd gathered to hear him speak.
Footage from national broadcaster NHK showed the prime minister turning to look backwards as a person was detained by security and people moved away, some shrieking.
Seconds later, a blast was heard and white smoke filled the air.
Images in local media showed a silver, pipe-like object on the ground, but it was not immediately clear whether it had caused the blast and smoke.
NHK said a man had been arrested at the scene on suspicion of obstruction of business. Local police declined to comment.
People at the scene described moments of panic.
"I ran frantically, and then, 10 or so seconds later, there was a loud sound and my kid started crying. I was stunned, my heart is still beating fast," one woman told NHK.
A man at the scene told the broadcaster that "when we all stopped in front of the podium, someone started saying 'culprit!' or something, or 'an explosive was thrown,' so everyone started dispersing fast."
"And then, about 10 seconds after the culprit was captured, there was a blast," he said.
'Unforgivable atrocity'
Kishida was unharmed, and soon resumed campaigning, including a stop at a local train station.
"There was a loud blast sound at the previous speech venue. Police are investigating details, but I'd like to apologise for worrying many people and causing them trouble," he said.
"An election that's important to our country is taking place, and we must work together and follow through on it."
He was also due to appear at a stop later Saturday afternoon in Chiba, east of Tokyo.
"That something like this happened in the middle of an election campaign that constitutes the foundation of democracy is regrettable. It's an unforgivable atrocity," Hiroshi Moriyama, the ruling Liberal Democratic Party's election strategy chairman, told NHK.
Security at local campaign events in Japan can be relatively relaxed, in a country with little violent crime and strict gun laws.
But the country bolstered security around politicians after the assassination of Abe, who was shot and killed while speaking at a campaign event in July 2022.
His alleged assassin, Tetsuya Yamagami, reportedly targeted him over his links to the Unification Church, and the incident sparked revelations about the connection between the sect and political figures in Japan.
Yamagami was reportedly angry at the sect over large donations his mother made to the group that left the family bankrupt.
The head of Japan's National Police Agency, and the local police chief, resigned in the wake of Abe's assassination after an investigation confirmed "shortcomings" in the security for the former leader.
The investigation slammed a system under which local police were given responsibility for the security of visiting senior officials.
With proper security, "it is deemed highly probable that this incident could have been prevented", the report concluded.
The incident comes as Group of Seven climate and energy ministers meet in the northern city of Sapporo, and a day before G7 foreign ministers arrive in Karuizawa in Nagano for talks.
Japan will host the G7 leaders' summit next month in Hiroshima.
In Sapporo, US envoy John Kerry said he had not been informed about the incident.
"I would be deeply concerned. He is a personal friend as well as somebody whom I admire very very much," he said.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
Featured Video Of The Day
ISRO's Developmental Flight Carrying Earth Observation Satellite Lifts Off
Japan PM Fumio Kishida To Step Down Amid Sinking Poll Ratings Japan PM Fumio Kishida Cancels Central Asia Trip Amid Megaquake Warnings Vladimir Putin, Japan PM Express Condolence Over Hathras Tragedy That Killed 121 How Extreme Weather Is Leading To Rise In Child Marriages In Pakistan Monkeypox Cases Rising: How Worried Should You Be - 10 Points 3 Days After Big Order On Deposits With SBI And PNB, Karnataka Hits Pause Hamas Rejects "New Conditions" In Proposed Gaza Deal: Report How Jail Slippers Helped Reunite Mentally-Challenged Man With Family Farooq Abdullah To Lead National Conference In J&K Assembly Polls Track Latest News Live on NDTV.com and get news updates from India and around the world.