Major internet services including Twitter, Neflix and Spotify have been affected by a series of cyber attacks, which have taken large portions of the internet offline.
Top US security agencies including the US Department of Homeland Security and the FBI are investigating the repeated attacks, which made dozens of sites inaccessible to millions of users in the US and elsewhere on Friday.
The discussion site Reddit, hospitality booking service Airbnb, the money transfer service PayPal and news sites including CNN, The Guardian and The New York Times also reported disruption.
The attacks targeted the little known internet infrastructure company, Dyn, which provides crucial services to all the affected sites.
Dyn routes and manages internet traffic. Put simply, it serves as a gateway for people to access thousands of websites.
The company said it had resolved one attack launched yesterday morning, which disrupted operations for about two hours. A second a few hours later was causing further disruptions.
"Our engineers are continuing to investigate and mitigate several attacks aimed against the Dyn Managed DNS infrastructure," Dyn said on its website.
The disruptions expose worrying vulnerabilities in the overall network at a time of unprecedented fears about the cyber threat in the United States.
In recent months hackers have reportedly breached both political organisations and election agencies.
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