Personal Info of 3,900 Tochigi Police Staff May Have Leaked — 5ch Reacts: ‘This Is Bad’

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The story

It has come to light that unauthorized access to the disaster-information distribution service “Arcadia” may have leaked the personal information — names, departments, phone numbers, and more — of all roughly 3,900 Tochigi Prefectural Police staff. The service was originally a mailing system for safety-confirmation checks during disasters, and it appears police employee data was registered on it as well. The thread ranged widely: worries about scam calls impersonating police using the leaked data, questions over why a safety-check system needed such detailed personal information in the first place, and a running battle of corrections over the difference between the ranks “Superintendent-General” and “Senior Commissioner.”

10/20 (Tue) 10:54 JST

Mainichi Shimbun

Regarding the case in which disaster-information distribution service provider Arcadia Co. (Minoh City, Osaka Prefecture) suffered unauthorized access, raising concerns about a possible leak of personal information, it was learned on the 20th, through an inquiry with the Tochigi Prefectural Police, that the personal information of all roughly 3,900 Tochigi Prefectural Police staff members who used the company’s service may have been leaked.

Source: news.yahoo.co.jp / Read the original article here

What people said

2AnonymousOct 20, 2026 17:46
Is the Superintendent-General gonna get his head on the chopping block for this?
53AnonymousOct 20, 2026 18:10
Re: #2
Honestly, a lot of people get this wrong, so let me clear it up:
the Superintendent-General (警視総監) is specifically the chief of the Metropolitan Police Department (Tokyo).
Tochigi Prefectural Police's chief holds the rank of Senior Commissioner (警視監).
"Superintendent-General" and "Senior Commissioner" are ranks above Sergeant, Assistant Inspector, Inspector, Superintendent, and Chief Superintendent.
In smaller prefectures, the chief holds the rank of Commissioner (警視長) instead.
No prefectural chief — including the Metropolitan one — has any authority outside their own jurisdiction.
It's the National Police Agency's Commissioner-General who oversees all the prefectural forces together.
64AnonymousOct 20, 2026 18:14
Re: #53
Apparently there's a mountain of people who file complaints about lazy local police… with the night-duty staff at the Tokyo District Public Prosecutors Office, lol.
172AnonymousOct 20, 2026 22:29
Re: #53
The rank "Senior Commissioner" (警視監) only exists at the Metropolitan Police Department and Osaka Prefectural Police. Every other prefecture's police chief holds the rank of Commissioner (警視長).
24AnonymousOct 20, 2026 17:54
This is a total mess at this point.
This is exactly why I said they need a punishment system in place.
34AnonymousOct 20, 2026 17:59
Isn't the public basically laid bare already — it's just that most of it hasn't come out yet?
42AnonymousOct 20, 2026 18:02
Security clearly isn't working here, so they might as well switch to paper.
Throwing money at this stuff is just a waste.
44AnonymousOct 20, 2026 18:05
Re: #42
Pfft, there's no way there's any kami left, zura~ (a pun on 紙/"paper" and 髪/"hair," plus "zura," a comedic catchphrase ending)
46AnonymousOct 20, 2026 18:06
From now on, scam calls claiming to be officers from Tochigi Prefectural Police are gonna become a regular thing.
And then the scammers will probably tell victims to go verify their identity with Tochigi Police directly — I mean, lol, they really do exist.
111AnonymousOct 20, 2026 18:52
Re: #46
Yeah, this is bad.
Calls from the "actual" police were already getting hard to trust as it is.
50AnonymousOct 20, 2026 18:08
Did they sink the Arcadia?? Off with Harlock's head! (a play on Captain Harlock's ship, also named the Arcadia)
54AnonymousOct 20, 2026 18:10
Re: #50
"I cast away my life, and still I live on" —

ah, nah, we're good without that bit (quoting the Captain Harlock theme song)
51AnonymousOct 20, 2026 18:09
Could this get people stalked by criminal organizations?
58AnonymousOct 20, 2026 18:11
Re: #51
Police and politicians are the kind of jobs that attract grudges easily, so
yeah, the leaked info's probably gonna get used for something worse than just scams.
56AnonymousOct 20, 2026 18:11
Did info on public security (counter-intelligence) officers leak too?
60AnonymousOct 20, 2026 18:12
Re: #56
Better it "washed away" (流失) than that it "wet itself" (おもらし) — way less embarrassing. (a riff on a typo: 流失, "washed away," instead of the correct 流出, "leaked")
57AnonymousOct 20, 2026 18:11
So this is where it all kicks off for Tochigi Police.

66AnonymousOct 20, 2026 18:16
Re: #57
Public security's the scary part.
Extremists and organized crime groups are gonna be gunning for them, seriously.
62AnonymousOct 20, 2026 18:13
> It's a system that sends a mass email to staff during disasters to check on their safety

Do we actually need this thing?
68AnonymousOct 20, 2026 18:17
Re: #62
Isn't it more like, "if you're alive after something like the 3/11 quake, get over to XX and help with the rescue effort"?
Feels like public servants kind of need this.
76AnonymousOct 20, 2026 18:26
Re: #62
For real talk: it's so they can issue work orders to staff confirmed safe.
They need to know immediately who can move and who can't.
The Wide-Area Emergency Support Unit that backs up the riot police is made up of young officers from local stations and HQ staff, so
they have to report things like "Tochigi Police can mobilize XX emergency responders" to the National Police Agency right away.
63AnonymousOct 20, 2026 18:13
Scam calls using the name of a police department that actually exists are gonna be tough to deal with.
72AnonymousOct 20, 2026 18:20
Re: #63
Ugh, we're done for.
They're definitely gonna call saying "This is so-and-so from Tochigi Prefectural Police."
And if the target is also someone whose driver's license leaked in the Times Car-Share incident, that'll make the call even more convincing.
What are they even doing…
75AnonymousOct 20, 2026 18:24
Re: #63
Scammers never actually get the police or government to do anything for you, so people who fall for it will fall for it the same way they always have —
it's the in-person visit scams that are gonna be the scary ones.
67AnonymousOct 20, 2026 18:17
> The service sends a mass email to staff during disasters to check on their safety

It's just a mailing list! Why the heck would it need the stuff below?? lol

> names, departments, job titles, cell phone numbers
73AnonymousOct 20, 2026 18:21
Re: #67
Not the same service, but back when I was on a temp dispatch job, they made me register my home address and phone number as a disaster emergency contact, lol.
I've long since left that job, so I'd like to believe they deleted it…
96AnonymousOct 20, 2026 18:41
Re: #67
If you don't respond to the email, they'll actually call you —
a safety-check system's pointless unless it goes that far.
69AnonymousOct 20, 2026 18:18
Email address alone should've been enough.
The system's just badly designed.
Other places are probably at this same level, they just haven't made noise about it.
90AnonymousOct 20, 2026 18:34
Re: #69
Probably they used the disaster-info distribution system meant for regular residents to provide a service to the police,
which is why police staff's personal info ended up registered in there too.
78AnonymousOct 20, 2026 18:26
The scariest kind of personal-info leak, I'd think, would be from adult/porn sites — so why hasn't a single one of those reported a leak yet?
Maybe they've already leaked and just haven't announced it.
89AnonymousOct 20, 2026 18:34
Re: #78
True that.
Given how carpet-bombing these attacks have been, it's likely already leaked and the people running those sites just haven't noticed yet.
108AnonymousOct 20, 2026 18:49
Re: #78
Maybe because the attackers are using that data themselves??
102AnonymousOct 20, 2026 18:45
Re: #96
Wouldn't it be a superior or some other prefectural police staffer making the calls?
Why would an outside contractor need to know that?
104AnonymousOct 20, 2026 18:48
Re: #102
There's a retired officer (OB, i.e. an "old boy"/alumnus) involved in that.
115AnonymousOct 20, 2026 18:55
Re: #102
Given how much has already leaked,
people really need to delete whatever info they can delete themselves, right away.
143AnonymousOct 20, 2026 19:55
Easy fix: everyone just moves house
and changes their phone number and email.
Problem solved.
150AnonymousOct 20, 2026 20:14
Re: #143
Funny how it's always the people who can't even understand the source article who say stuff like "just move."
154AnonymousOct 20, 2026 20:32
Re: #143
So the scenario is: all of Tochigi Prefectural Police's staff moves out of the prefecture, and Tochigi becomes a lawless wasteland?
Is that it?

Though if it actually came to that, I guess they'd just bring in officers from other prefectures — basically swap out the whole staff.

Background and Key Points of This Story

This leak is one of a series of issues stemming from unauthorized access to Arcadia, a disaster-information distribution service for local governments, which Tochigi Prefectural Police reportedly used for staff safety-confirmation emails. What sets this apart from a typical personal-data leak is the heightened risk specific to leaking police staff information: scammers and in-person con artists can exploit real department names and real names to make their schemes far more convincing than usual. The thread also saw a string of posts conflating the rank “Superintendent-General” (警視総監) with the chiefs of other prefectural police forces, prompting corrections that a chief’s rank varies by the size of the prefecture, and that only the Metropolitan Police Department and Osaka Prefectural Police have a chief holding the rank “Senior Commissioner” (警視監). How much detailed personal information a safety-confirmation system really needs to collect is also a broader question that applies to disaster-response systems in general.

*This article is excerpted and summarized from the 5ch (News Express+) thread “[Unauthorized Access] Personal Information of All Tochigi Prefectural Police Staff Possibly Leaked — Arcadia Unauthorized Access.”

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