As per the data collected by CERT-In, a government agency of the Indian Community for responding to computer security incidents as and when they occur, reported that a total of 1981 websites were defaced in the first three months of 2010.

Website defacement in general is a kind of an attack by hackers that changes the visual apperance of a web page or replaces the real webpage of a website with their own.
Comparing the results with past trends, I am not really surprised at these statistics...