North Korea back online after nearly 10 hour total blackout

North Korea is back online after a nearly 10-hour total blackout Monday.

Dyn Research, which first recorded the total internet outage, said the entire country was offline for exactly nine hours and 31 minutes.

North Korea has four official networks connecting the country to the Internet, all of which route through China. The U.S. has more than 152,000 such networks, according to Dyn Research.

North Korea lost internet access just days after being formally accused by the U.S. government of being involved in the Sony Pictures cyber attacks. This led some to speculate that the U.S. was behind the outage as part of President Obama’s promised “proportional response.”

U.S. officials would not comment on these allegations nor would they lay out their plan of attack against the nation.

Some experts don’t believe this is the work of the U.S. government, Time reported.

Matthew Prince, the co-founder of Cloudflare, told the news agency that internet connection in North Korea had been flickering on and off, indicating that the alleged attack was not “technologically sophisticated.”

“It’s far more likely this attack was carried out by a 15-year old kid in a Guy Fawkes mask than the National Security Agency,” Prince told Time. “If a nation state decided they would launch this attack, it’s much more likely you’d see a total collapse.”

He also said that since all of North Korea’s internet connections are routed through China, this could just be an example of China flexing its muscle or of North Korea shutting the internet down themselves.