" Q2) Can you think of anything that might have caused the attack? A) As you know, there are currently around 3000 B.O.W. terrorism incidents each year, and the BSAA has made over 1000 deployments to stop such terrorist attacks. Therefore, we believe the reason behind the attack exists within the organization itself and that this attack was related to this. "
Found this from batman's timeline. Timeline 2005-2009. Page 254.