Now here is a classic click fraud symptom. This user at 172.24.6.31 used a proxy server at a Level3 site 65.57.245.11 in San Francisco to find four of our ads and click them within seconds.
Update: The “cuplrit” was Google. Apparently the Adwords people use this IP address when checking your ads. 
The official answer from Google about these clicks was some boilerplate answer which said how wonderful their system is, but nothing specific.
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