Nidal Hasan walked into a medical treatment center at Fort Hood, Texas, pulled out a semi-automatic pistol, and shot 42 people, killing 13 of them. Because of the shooting, Obama delayed and shortened his trip to Japan.
Presumably, either the Europeans or the CIA was responsible for the attack. Presumably, those responsible wanted to send a message to Japan. We will not allow America to get too close to you. We will punish and disrupt America whenever she does something to build an Asia-Pacific Community.