We don't know what happened.
There can be many explanations and not just the one that the MSM wants to push.

 "What can explain the rise of fake anti-Muslim crimes? Ibrahim Hooper of the Hamas-linked Council on American Islamic Relations (CAIR) explains that Muslims in America are "under great psychological stress and tension right now, and that in itself can cause mental health issues that lead to these types of incidents."
http://www.meforum.org/6586/fake-anti-muslim-backlash