A bunch of Turkish hackers apparently hijacked the web addresses of a whole bunch of sites on Sunday evening, redirecting people to a web page that they control. This DNS hijack hit both The Telegraph and El Reg. The hijack seems to be over now.
They claimed it was 'World Hackers Day' and that the DNS hijack was "just for fun".
Probably had some ulterior motive that this "just for fun" was hiding.