Google apologies for displaying every URL as a harmful URL, Techcrunch and some blogs notified about this issue.

If you had searched any queries in Google between 6:30 a.m. PST and 7:25 a.m yesterday, you can see the search result as shown below picture.

The official Google blog explains, it’s a  human error caused after updating the list of harmful URL’s.

This issue affects Gmail also and Gmail blog explains that spam mails are also notified by harmful url’s and if you had recieved any mail between 6:30 a.m. PST and 7:25 a.m yesterday and there is a chance of getting important mails in spam folder. So just check your spam folder and confirm it.