Google services went dark on Monday for users around the world, with its most popular services, including Gmail, Google Drive and YouTube affected.
The outage occurred around 7 a.m. ET and seemed to be resolved for many users around 30 minutes later.
Google's own website that logs outages showed that all of the company's services were suffering from outages.
YouTube also confirmed the outage in a tweet.
"We are aware that many of you are having issues accessing YouTube right now – our team is aware and looking into it," company's video platform said in a tweet at 7:09 a.m. "We'll update you here as soon as we have more news."
An hour later YouTube said it was back up and running.
A Google spokesperson said in an emailed statement that the company "experienced an authentication system outage for approximately 45 minutes due to an internal storage quota issue."
"All services are now restored," the spokesperson said. "We apologize to everyone affected, and we will conduct a thorough follow up review to ensure this problem cannot recur in the future.”
Users took to social media reporting the issue, with some complaining that the outage even affected their smart home systems.
Some of the largest companies in the U.S. rely on Google services, according to CNBC, including Uber, Netflix and Twitter.
In June 2019, Google experienced a four-hour outage in the U.S. for many of its services, including Google Cloud, G Suite and YouTube.