A series of outages at mobile providers, ISPs, streaming services, games and social media platforms prompted speculation Monday that the U.S. could be under a massive coordinated DDoS attack, though security experts said that scenario seemed unlikely.

Customers at AT&T, Sprint, T-Mobile and Verizon reported cell service disruptions while the Downdetector plotted reports of outages at Google, Zoom, Instagram, Facebook, Twitter, Netflix, Chase, Hulu and other organizations.

While AT&T pinned the problems reported by its customers to an internal voice and data issue, an Anonymous twitter account fueled the fire, speculating that China might be behind a DDoS attack on the U.S.

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