What is “troubling” about this note left on a California mosque?

A troubling note was found taped on the front door of the Islamic Center of Temecula Valley in Murrieta. It was discovered on Sunday during evening prayer.

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KABC  The note makes mention of the recent mall attack in Kenya and the suicide bombing at a church in Pakistan. The note did not contain any specific threats, but police are investigating. (Yes, because when Muslims call, police have to drop everything and jump on another idiotic investigation that never goes anywhere)

The Islamic Center is offering a reward for information on who may have left the note.