Investigating

Mitaka City: Arcadia SpeeCAN RAIDEN intrusion may have exposed emergency-delivery and staff-assembly registrant data

Disclosed Oct 14, 2026. SpeeCAN RAIDEN (Arcadia) intrusion may have exposed emergency delivery (22 citizen phones / 12 facility FAX) and 1,218 staff-assembly mail records (name/unit/staff-id/email). Subsets not summed.

Last updated: 2026-11-09

Overview

Subsets not summed → blank.

Timeline

  1. Occurred
  2. Discovered
  3. Disclosed

Organization response

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

What you can do

Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.

Sources

  1. 不正アクセスによる個人情報等の漏えいの可能性について三鷹市 · 2026-11-09

Related information

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