Avast alert while web searching

[system]

Had following Avast alert while doing a web search :

http://fr.weather.yahoo.com/suède/värmland/karlstad-8
HTML:Iframe-inf

Please, can you have a look.

Of course, we abandon the connexion, as Avast suggested to do so.

[system]

That would be the yahoo false positive…

http://forum.avast.com/index.php?topic=52692.msg446420#msg446420

@jsejtko post:24

Hello guys,

this false positive will be corrected in new vps update in about 30 minutes. We are blocking ads from yieldmanager.com (by mistake because they were in our stats as distributor of Fake Antivirus websites).

Thank you for information you have provided.
Regards