Internet hackers using the name of Hamas's armed wing, Izz ad-Din al-Qassam, launched a distributed denial of service (DDOS) attack on the website of American Express last week, the Infosecurity website reported.
The attack managed to knock the website offline for a few hours, the report said, adding that the hackers had cited the anti-Islamic video The Innocence of Muslims as their motivation.
In DDOS attacks, many computers infected by a Trojan horse are directed to visit internet sites selected by the attacker as a target. If enough requests are directed at a server, it will crash temporarily.
According to Infosecurity, the hacking group "has long been tied to Iran by the US officials," adding that the hackers themselves have vowed to continue cyber attacks until the film is removed from YouTube.