In the security field you too often hear the senteneces like "this is an unfamillar attack BUT WE SUFFERED NO DAMAGE AND NO INFORMATIO LEAK" , question is what is the meaning of "NO" in those type of sentences.

The same story you can read:

"Hackers recently targeted Naver, Korea's largest Internet portal, in a ever-before-seen kind of attack. Choi Whee-young, CEO of Naver's parent NHN, said in a meeting with reporters Thursday that Naver users recently had trouble accessing the portal's cafes because it had to temporarily lock access after detecting new kinds of hacker attacks." Read here