alert on SAfari search

You may  have adware/malware installed. Try downloading this program which was written by Thomas R, a long time poster. The program will search for malware/adware The program will do the work for you which makes it easy. It may be necessary to run more than one scan. After running the scans, restart the computer.

Malwarebytes Anti-Malware for Mac      10.10 and later

Malwarebytes uninstall

If you are not using a VPN, this pop-up is a scam.

Close pop-up ads

Start by closing any pop-ups that are open.

• If you see a Block Alerts button after dismissing a pop-up on your iPhone, iPad, or iPod touch, tap the button to stop showing alerts from that webpage.

If a pop-up won't close:

• On your iPhone, iPad, or iPod touch, force Safari to close. To prevent Safari from automatically reopening any windows, go to Settings > Safari, then tap Clear History and Website Data. This also removes your browser history and cookies.

https://support.apple.com/en-us/HT203987