The ringleader (Abdelhamid Abaaoud) was already on counter-terrorism watchlists from previous activities, including a previous terror attack in Belgium.[1]<p>[1] <a href="http:&#x2F;&#x2F;www.theguardian.com&#x2F;world&#x2F;2015&#x2F;nov&#x2F;16&#x2F;abdelhamid-abaaoud-suspected-mastermind-of-paris-terror-attacks" rel="nofollow">http:&#x2F;&#x2F;www.theguardian.com&#x2F;world&#x2F;2015&#x2F;nov&#x2F;16&#x2F;abdelhamid-abaa...</a>