i just find out it by seeing my CTR rate and got 24 US clicks,, becoz daily im getting 1-3 clicks , suddenly i got 24clicks from US, i noticed that they are invalid
Use ClickAider to track the click bombing. Click Aider will detect clicks to your Google Adsense and other PPC networks.
thats interesting point and I'd like to know the answer. Adsense is very risky and you one must need to be alarmed always.
May be sometime unknowingly a visitor can click the ads multiple times or if someone jealous of your adsense earnings