The group of Hackers, called Anonymous, used Twitter to rally support for the online attacks, which also targeted PayPal, Mastercard and Visa.
It later announced on Twitter that it would give up the attack, adding that it didn’t have enough “forces”.
It is understood the group will now redouble its efforts to crash PayPal’s site.
Last week it emerged Amazon could face a boycott by free-speech campaigners. WikiLeaks had been using Amazon’s servers to host its site after its own server was attacked a few weeks ago.
Amazon has also drawn fierce criticism for stocking a Kindle book called “WikiLeaks Documents Expose US Foreign Policy Conspiracies”.
Amazon had been accused of double standards for taking profits from sales of the book while also blocking WikiLeaks from using its server.
Brands Mastercard, Visa, and PayPal have all been targets, having pulled their services from WikiLeaks.
It is understood Facebook and Twitter have both separately suspended accounts representing the group, including the Operation Payback Facebook account.
This story first appeared on newmediaage.co.uk