Critical Threat! ALERT - says from Apple Security - clean.protection-apple.store

On iphone, using Safari (Google Search Engine), an Alert message popped up which said Apple Security at the top; URL was clean.protection-apple.store; message said "Critical Threat! your device has been infected with 21 viruses after visiting etc etc etc". there was an OK button which I did not click on. I powered off/on the device and also "cleared browsing history and website data". The "Block pop-ups" setting was already set to ON before the message appeared. Was this message from Apple or whats going on ? what additional steps should I take to make sure device is okay?