See for any unusual code on your site script. Also check the server logs. If you cant find anything supicious contct your web host.
I have noticed some sites have been doing this lately. I heard that it is when someone hacks into your server and installs some bad code.
I just try http://www.google.com/interstitial?url= other URLs why it is not working ? I got the message Forbidden Your client does not have permission to get URL
it is not because iframe agree it shall due to the javascript from either site google can easily check all tiny javascripts
it is because there had java scripts running inside of iframe site page example: <iframe src ="another-site-url.php" width="1" height="1"> </iframe> it not because an iframe affect your site Google and yahoo all had warned there were many masters download free forums or php-bb or other site theme scripts which included the iframes which are not made by original designers. the "another-site-url.php" can use browsers ip to run its java scripts when users browsing your site or do some otherthings else Google detected the another-site-url.php had malware java scripts were running it is not because your site has an iframe. Google do not care iframe but the malware scrupts running. Google have bots cache and running your site so Google know.
Google won't definitely email you with that kind of thing if they didn't find anything suspicious. Double check everything on your site. They also mentioned that it is some sort of a hidden text or codes.
this iframe hack happen mostly on blogs, i had 3 blogs attacked by hackers . i've fixed up the codes an put some permissions on files and it seems that it worked
View the last line in the source code of your homepage. I am seeing an invisible iframe there which is causing this problem. Just remove it.
good idea to change permissions since you allow people can post code on your bolg or site better check all links on posts for safe browsing
Same thing happened with my 50 blogs (on my 2 hosts) and this iframe code will go only in your index.php, index.html files. we have to remove it manually which i did 10 days ago but it killed my 2 days Raj
There are so many of these that are happening. It is best to be completely aware, and to check your website and also computer because the chances are that if your website has been infected and that you have since then accessed your website then your computer may also have been infected. ~ Mike
You do look through your website code for anything that looks out of place or if you still have the main website files on a local machine that you could re-upload to your website and then contact the website hosting provider and make sure that all security issues have been discussed and resolved. ~ Mike