The number of web site defacements continues to escalate between opposing Sunni and Shiite groups:
"Last month, prominent Sunni religious commentator Sheikh Yusuf al-Qaradawi charged that Shiites are "invading" Sunni societies. Also, a tit-for-tat cyber war disabled 900 websites, belonging to both sects, as Shiite and Sunni hackers infiltrated religious websites and uploaded their own messages."
More information on these attacks is available at: Sunni-Shiite hacking war disables 900 websites
Al Arabiya hit by Sunni-Shiite hacking war