Businesses with MiddleEast connections have been warned to be on guard against cyber-attacks as the conflict between Israel and Hamas in the Gaza strip escalates.
Hacker groups from Iran, Lebanon, Morocco and Turkey have defaced a large number of websites and the trend is accelerating, said security firm Fortify Software.
An increased number of botnet attacks on Israeli targets have been identified by network security firm Arbor Networks.
The firm has been monitoring effects of the conflict on internet activity.
Jose Nazario, Arbor's head of research, identified a website that is using distributed denial of service attacks (DDoS) to target Palestine-related websites.
Thehigh-level cyber defences of government and military organisations mean that hackers are turning their attention to less protected organisations.
Any company with perceived links to parties involved in the conflict could find their web sites and online systems under attack, said Bruce Jenkins of Fortify.
Jenkins, a former US Air Force major, said many tens of thousands of companies could find their hacker attack profile raised significantly as the conflict continues.