An unprecedented cyber attack has knocked Liberia's internet offline, as hackers targeted the nation's infrastructure using the same method that shut down hundreds of the world's most popular websites at the end of last month.

The attack, which is the same used to shut off sites including Netflix, eBay and Reddit, fuels fears that cyber criminals are practicing ways to sabotage the US' internet when the country heads to the polls on November 8.

Multiple attacks against Liberia's rudimentary internet infrastructure have have intermittently taken the country's websites offline over the course of a week. Although it isn't clear who was behind either attack, experts said the method used was simple enough to have been launched by a lone actor and that it appeared to have come from the same source.