(Bloomberg) -- Hackers temporarily shut down access to websites for internet users along the U.S. East Coast Friday morning, in what experts say was a coordinated and curiously timed attack on one particular Domain Name Server provider.

Dyn Inc. reported a distributed denial-of-service, or DDoS, attack at around 7:10 a.m. New York time, which left millions of people without access to Twitter, Spotify, Reddit and The New York Times, among other sites. Dyn restored service at 9:20 a.m. but was offline again at around noon, as another attack appeared to be underway, also affecting the West Coast.

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