] 25 June 2001:

The accident investigation report was published on 4 September 2001.

The Eniwa City official site, in Japanese, at
http://www.city.eniwa.hokkaido.jp/mmb/020202/020202.html
and the Kitahiroshima City official site, in Japanese, at
http://www.city.kitahiroshima.hokkaido.jp/new/joho1.htm
have a copy of the accident investigation report, with illustrations and timeline:

The F-4EJ Kai belonged to the 302nd Hikoutai, 83rd Koukuutai, JASDF.

The cause was: during maintenance, when an exterior panel on the left wing was replaced, and a drill was used to fasten the rivets on the “nut plate”, the drill damaged and short-circuited the wires for the cannon and for the rocket pod. Consequently, activating the rocket pods might activate the cannon.

At 10:48, it was the first of a flight of four that took off from Chitose AB, Hokkaidou. They arrived in the Shimamatsu firing range, Hokkaidou, and began their training mission.
The accident aircraft began its rocket pod practice. The first pass, a “dry pass”, and the second pass, a “hot pass”, were without problem.
At 10:57, during the third pass, while turning right towards the “base leg” or final approach to target, the crew felt by sound and vibration that the cannon fired.
At 11:18, it landed at Chitose AB. Post-flight check counted the cannon fired 188 rounds.

The cannon rounds landed outside the firing range, and hit the Kitahiroshima Rehabili Centre,
http://www.h-chosonkai.gr.jp/zaidan/shisetu/kitahiro/framepage1.htm
the Sun-Park Sapporo Golf Course,
http://www.pacificgolf.co.jp/sun-park/index.asp
and some cars.
http://www.minsyu.net/news/news010627.htm

[Incident Report] JASDF incident on 27 June 2005 in Japan

In the Japanese (Japan) news site Yahoo! Japan News, an article at
http://headlines.yahoo.co.jp/hl?a=20050628-00000106-kyodo-soci
reported:

On 27 June 2005, a JASDF C-1 transport dropped a part.

The aircraft belonged to the Gifu AB, Kakamigahara City, Gifu Prefecture.
At 12:40, it took off for a training sortie above the Enshuunada Sea, Shizuoka Prefecture.
At 14:20, it returned to base.
During the post-flight check, the glass cover of a light was cracked and missing. It was 2 cm by 10 cm, weight 30 g.
It could have dropped off when the aircraft was landing, but they searched inside the base and did not find it.
No damage to human or property was reported.

[Accident Report Update] USMC accident on 27 September 1977 in Japan

] On 27 September 1977, an USMC RF-4B took off from Atsugi
] AB, Kanagawa Prefecture, had an engine fire, and crashed.
] In the burning residential area, nine persons were heavily
] wounded. Two children died the next day. Four years later,
] the two children’s

Still curious about the details of this accident in Japan, I researched some more.

http://www.cityfujisawa.ne.jp/~t.a.arai/takashi/atugikiti/papamamabyebye.htm
has an overview of the accident, and a photo of the statue of the three victims (mother Hayashi Kazue and her two sons Hayashi Yuuichirou and Hayashi Yasuhiro) in the Minato no Mieru Oka Kouen park in Yamate Ku, Yokohama City, Kanagawa Prefecture.

On 27 September 1977 (Shouwa 52), about 13:17, an USMC RF-4B fighter took off from Atsugi AB. It belonged to a squadron based at Iwakuni AB.

About 13:20, it was on its way to the USS Midway in the Sagami Bay, when its left engine caught fire. Its two crew ejected, and it crashed in Eda Chou, Midori Ku (now Aoba Ku), about 15 km northwest of downtown Yokohama City.

About 2 km from the crash site, the Yokohama City Kurogane Primary School was having a sports day. The teachers, students, and parents witnessed the crash, and aborted the sports day.

The crashed fighter and its fuel set fire to the houses and parks in the residential area.

The JMSDF at Atsugi AB scrambled a SAR helicopter. 10 minutes after the accident, the SAR helicopter arrived at the crash site, recovered the two crew, who weren’t wounded, and returned to base. The JSDF and the US military didn’t notify the fire department.

Workers from a nearby construction site and ambulances summoned by local residents rescued and delivered nine wounded persons to the Aobadai Hospital and the Shouwa University Fujigaoka Hospital.

The US military who consequently came to the crash site did not help to search and rescue the wounded. Instead, they barricaded the crash site from even the Kanagawa prefectural police, while they removed the wreck and debris.

At the Aobadai Hospital, Yuuichirou (DOB 24 August 1974) passed away at 00:50. He was three. Yasuhiro (DOB 28 March 1976) passed away at 04:30. He was one.

At the Shouwa University Fujigaoka Hospital, Kazue was 26. 80% of her body was burnt. She upheld her will to live when she was told her sons were being treated at another hospital. She learnt their deaths only one year and four months after the accident.

Because of her injury and respiratory illness caused by the burning jet fuel, she was frequently treated at hospitals.

The Japanese government mostly ignored her repeated protests, considered her a psychiatric patient, and confined her at the National Musashi Clinic.

On 26 January 1982 (Shouwa 57), during the cold night, about 01:45, she had breathing difficulty again, was not treated, and passed away, four years and four months after the accident. She was 31.

Besides she and her sons, three others were heavily wounded, and four lightly wounded. Two houses were destroyed, and three damaged.

The Japanese media mentioned this controversy again after, on 13 August 2004, about 14:15, an USMC CH-53D helicopter crashed and caught fire in the Okinawa International University campus in Ginowan City, Okinawa Prefecture; when the US military kept the Okinawa prefectural police from entering or investigating the crash site.