Firstly, I'd like to say hello to everyone because this is my first post here. One of my clients' website was penalised recently (4th Oct.) and while analysing the link profile I found a weird trend reported by both Majestic and Ahrefs link reports. My client's website is seven years old, DA53 and was performing very well over the years for competitive keywords. The site's link building used directories and sponsored articles on high DA blogs and websites, so it wasn't really black hat. At the beginning of September, one month before the penalty, hundreds of "news" domains started linking to my client's website. Such sites were sumatranews, harriscountynews, islamicnews, rwandanews and hundreds of similar domains. Screenshot from Ahrefs new/lost domains report and Majestic are attached. They all linked from the /search/Insurance?offset=40 page to my client's homepage. These domains look very spammy, especially because e.g. islamicnews is 302 redirected to australianews, then 301 redirected to news dot net, but if you are outside of Australia, then islamicnews is 302 redirected to news dot net. All of these domains are redirected to a search results page on news dot net. According to Ahrefs, these new linking root domains disappeared during the second half of September because all of these domains were redirected to news dot net and Google Webmaster Tools shows the linking pages from this website. It?s not clear why these spammy domains linked to my client, whether it was "just" a content scraper, a malfunctioning CMS or negative SEO, but it?s very suspicious. I checked the domain information of this news domain but their phone customer support is in Hong Kong and the lady couldn't give me useful information about these other websites. That?s how far I got with the investigation this afternoon. I?m not sure if this was just an accident or someone directly used this spammy domain network to "link bomb" my client's website, but if the latter is true, then it was definitely one of the reasons that triggered the Google penalty. I have seen negative SEO before, but none of them worked "efficiently"; however, those didn?t involve thousands of linking root domains. Interestingly, six other 1st page competitors received similar increase in linking root domains during the same time period. Do you know anything about this network? Have you heard about similar attacks?