bwnbwn - 8:00 pm on Jan 18, 2013 (gmt 0)
Hacking means it has happend before so as LifeinAsia said why worry about the ones placing the ads fix your holes and that should be it. Police will look at ya and say what, fix your site/server/host whatever is the problem.
They can claim ownership of your domain by placing their code on your hacked site and getting it verified. BTW they can do the same in Google webmastertools section and really cause you some poblems. Fix the holes, story over.