Public libraries in Manchester, England, have been advised to keep their eyes peeled for USB bugs after two devices were discovered monitoring every keystroke made by every user of affected PCs. The small surveillance devices were found attached to the keyboard sockets at the back of two PCs in Wilmslow and Handforth libraries. Its not known how long the devices have been in place at the libraries, or what information may have been stolen, but as the affected PCs have all keystrokes can be gathered by a returning criminal for later exploitation.”]
Source: https://grahamcluley.com/hardware-keyloggers-discovered-public-libraries/