At least two successive waves of online attacks blocked multiple major websites Friday, at times making it impossible for many users on the East Coast to access Twitter, Spotify, Netflix, Amazon, Tumblr and Reddit.

The first attacks appear to have begun around 7:10 am Friday, then resolved towards 9:30 am, but then a fresh wave began.

The cause was a large-scale distributed denial of service attack (DDoS) against Internet performance company Dyn that blocked user access to many popular sites standstill.

Dyn reported the sites going down at around 11:10 a.m. UTC, or roughly 7:10 a.m. ET, posting on its website that it “began monitoring and mitigating a DDoS attack against our Dyn Managed DNS infrastructure.”

In an update posted at 8:45 a.m. ET, the company confirmed the attack, noting that “this attack is mainly impacting US East and is impacting Managed DNS customers in this region. Our Engineers are continuing to work on mitigating this issue.”

White House Press Secretary Josh Earnest said the Department of Homeland Security was “monitoring the situation” but that “at this point I don’t have any information about who may be responsible for this malicious activity.”

Read More- USA Today

Image courtesy of- The Independent

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