710K accounts from PoliceOne (policeone.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In February 2017, the law enforcement website PoliceOne confirmed they'd suffered a data breach. The breach contained over 700k accounts which appeared for sale by a data broker and included email and IP addresses, usernames and salted MD5 password hashes. The file the data was contained in indicated the original breach dated back to July 2014.
Source: Have I Been Pwned (CC BY 4.0)