A supporter of WikiLeaks founder Julian Assange has hacked a Hertfordshire Police website and posted data apparently relating to members of the force.
Alongside the data, the hacker posted an “OpFreeAssange” banner.
The data relates to dozens of officers in Safer Neighbourhood Teams and appears to include log-in details, passwords, phone numbers and IP addresses, according to the BBC.
Hertfordshire Police said the data was stored on an externally-hosted database and that the Safer Neighbourhoods section of its website has been taken down as a precaution while they investigate.
In a statement, the force said: "There is absolutely no suggestion that any personal data relating to officers or members of the public has been, or could have been compromised.
"Nevertheless matters of IT security are extremely important to the Constabulary and an investigation is already underway."
The hacking attack is the latest in support of the WikiLeaks founder since the UK government said it would arrest and extradite Assange if he left Ecuador's embassy in London.
However, the hacker denied being a member of the Anonymous hacktivist collective, which has claimed responsibility for other attacks in support of Assange.