Elizabeth Renstrom for TIME
January 27, 2015 10:44 AM EST

Facebook says hackers didn’t cause a worldwide outage Tuesday morning, denying claims made by a rogue hacker group. Instead, the company said the 45-minute Facebook and Instagram outages were the result of an internal change made on the social network’s systems.

The disruption “was not the result of a third party attack but instead occurred after we introduced a change that affected our configuration systems,” a Facebook spokeswoman told The Wall Street Journal. “We moved quickly to fix the problem, and both services are back to 100% for everyone.”

Hacking group Lizard Squad appeared to claim responsibility for the outages, which made it impossible for Facebook and Instagram users to access those websites and apps.

Lizard Squad has also claimed responsibility for recent hacks against Malaysia airlines.

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