At least we know hackers had nothing to do with the outage of bing and yahoo searches.

This was after upload of bad code by Microsoft in what was supposed to be an update and Microsoft wasn’t able to revert changes quickly.

Users were unable to make searches using Bing and Yahoo and some searches through Cortana and Siri were not successful.
According to Tech Crunch, some users were unable to access some Microsoft domains like portal.office.com and outlook.com could not resolve.

Making a search on yahoo.com redirected to search.yahoo.com which showed a blank page.
Yahoo then put up a temporary error page saying the service will be right back.
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Update
Yahoo has also confirmed its outage:

“We are aware that Yahoo Search is unavailable to users. Our engineers are working to restore the service at the earliest.”

The search has been restored

Source: Tech Crunch