A Muslim terrorist was responsible who had infiltrated the US army, who identified with his own ethnic and religious kind and resented being sent there to fight against his 'own' people.
This is the problem with Islam, it cannot be loyal to anyone else but itself. You can be a Muslim anywhere in the world that is not muslim, but you are always a Muslim and loyal only to Islam.
That's the problem with the West and America, too god damn gullible, with its sense of decency and openness, it holds out the hand of compassion and it gets bitten, be it Mexican immigrants or Muslims. The Multicultural experiment has again shown to be an abject failure.
My sympathies and prayers are with the dead and injured.
I say to western world leaders, stop muslim immigration now before its too late, they will never be part of our society and values.