This is an nuisance attack known as blacklisting. Search engines and browsers put warnings up when they have been notified that a site is dangerous. WHen they get enough warnings, an automated warning message is generated. Some are more sensitive to these than others.The word 'attack' is not entirely accurate since the only purpuse is to divert traffic away from a Websight by frigtenening away users.In other words, it is a very LAME attempt by a few disgruntled former users, or some competing Web site.