Apple's iMessage and FaceTime messaging systems were hit with a glitch Tuesday that took the services offline for several hours. The problems for both services began shortly after noon Pacific Time and continued at the time of this writing, more than four hours later.
FaceTime is a video calling service and iMessage is an instant messaging service.
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Apple posted a short notice on its website saying "some users" were unable to make calls or send messages but provided no additional information.
It was unclear how widespread the outage was, but Twitter is seeing tens of messages every minute from users who say they are affected by the problem.
Of the two services, FaceTime is the older, having been introduced with the iPhone 4 in 2010. iMessage was introduced a year later when Apple released iOS 5.
Martyn Williams covers mobile telecoms, Silicon Valley and general technology breaking news for the IDG News Service. Follow Martyn on Twitter at @martyn_williams. Martyn's email address is firstname.lastname@example.org.