Is Yahoo Mail down? Weekend outage breaks email login

A large number of Yahoo Mail users were left without access to e-mail this weekend.
Reports of Yahoo Mail login not working flooded Twitter on Saturday morning, with complaints continuing into the early hours of Sunday.
https://twitter.com/statuses/718842423619751937
https://twitter.com/statuses/718866253222424578
https://twitter.com/statuses/718848732373065728
While a small number of users are now posting that the problem has been fixed, others are still reporting the issue as late as 11:00 (BST) on Sunday.
Yahoo has yet to publicly acknowledge any such issue on Twitter, although it’s clear from the volume of upset users that a problem does exist.
Twitter users slammed Yahoo’s customer support for its silence on the matter:
https://twitter.com/statuses/718871556668186625
https://twitter.com/statuses/718812527711424513
https://twitter.com/statuses/718828484517306368
Here’s the DownDetector complaint chart based on issue reports for Yahoo Mail over the last 24 hours:
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Yahoo Mail is one of the world’s most well-known e-mail services, having launched in 1997.
In 2011, it was ranked by comScore as the third-largest web-based e-mail service, and is estimated to boast over 280 million users globally.
Have you noticed any issues with Yahoo Mail recently? Let us know in the comments.