Google Search Shows Captcha Request – Thinks You are a Robot

Suddenly from this morning onwards, I’ve been getting this strange screen for most Google searches. I’ve never seen this is in the past and I’ve already seen it about 5 times today!

Google Search Captcha Request

To continue, please type the characters below

Our systems have detected unusual traffic from your computer network. This page checks to see if it’s really you sending the requests and not a robot. Why did this happen?

I’m using Google Chrome as my browser and always search using the omnibox. Any suggestions?