What source? at the bottom of the article, you literally said you guys were the source?  

And pretty sure it doesn't matter whether you put a proper attribution or not since you copied the whole article and published it in your site, unless ofc you got the author's permission for it, which doesn't seem like you do.

Making a news aggregator could be pretty tricky cause of copyright implications but the trick is just to just establish a mutual benefit. You see if you copied and publish their article in your site, you're basically stealing their revenue cause users don't have to go and read it on their site. So bottomline is to just make a title and link all those related articles.