Thousands of holiday gifts won't arrive by Christmas after an unpredictably large number of packages overwhelmed UPS, the world's largest package delivery service.
"The volume of air packages in our system exceeded the capacity of our network, as demand was much greater than the forecast," UPS spokeswoman Natalie Godwin said Tuesday. "As a a result a small percentage of shipments are delayed and will not be delivered today."
Godwin would not say how many packages had been delayed, but the delays are nationwide.
On Twitter, UPS issued a service update.
[SERVICE UPDATE] We are experiencing heavy holiday volume & currently delivering in all ZIP codes. Details here: http://bit.ly/18K5VRp