According to DownDetector, the problems began shortly before 9am EST.
— Eytan Schulman (@eytanschulman) January 14, 2016
— Lino Morales (@lino_and_rico) January 14, 2016
Apple has yet to acknowledge the outage. We have contacted Apple for more information and will update this post when we hear back.
Update (16:00 GMT):
Apple has updated its system status page to acknowledge the issue and says it has now been resolved.