On Wednesday afternoon, city websites showed only the message, “The page cannot be displayed.”
The group Anonymous, a loose network of hackers who launch cyberattacks over their favored social causes, appeared to claim responsiblity. On Twitter, an account affiliated with Anonymous declared, “Tango Down: http://oaklandpolice.com #ShutItDown #ICantBreath.”
Anonymous has supported recent demonstrations over the police killings of unarmed black men Michael Brown of Ferguson, Mo., and Eric Garner of New Yo