caricature blasphemy

In addition to the peaceful protests, physical attacks on the Danish and other European embassies & economic boycotts, cyber-attacks have also been launched at many European websites, specially those with the .dk domain

Zone-H, a security firm, lists the details of the 1000+ attacks here

One of the most prolific hackers around is the Pakistani group called GForce Pakistan. They were featured on the BBC and were also interviewed by an Indian security website. I am not sure if GForce Pakistan was involved in any of the attacks, they are mostly attributed to script-kiddies