Alphabet Inc.’s Google (GOOGL.O) said it plans to conduct an investigation into a network congestion issue that affected services in Google Cloud, G Suite and YouTube on Sunday.

Google said users of YouTube and other services saw errors or slow performance due to high levels of network congestions in the eastern United States.

The company first identified the issue on its Google Cloud status dashboard at 3:25 p.m. ET, and said the outage was resolved at about 7 p.m. ET.

The sound of millions of cat videos being suddenly silenced reverberated across the internet, and .YouTubeDOWN was a trending topic on Twitter.

With files from BNN Bloomberg