The Los Angeles Times reported Saturday the Council on American-Islamic Relations said the same handwritten, photocopied letter was sent last week to the Islamic Center of Long Beach, the Islamic Center of Claremont and the Evergreen Islamic Center in San Jose.
The letter was addressed to "the children of Satan" and said Trump will "cleanse America and make it shine again. And, he's going to start with you Muslims." It is signed by "American for A Better Way."
Both the Los Angeles and Bay Area chapters of CAIR have called for increased cooperation with law enforcement agencies to protect mosques.
San Jose Police Department spokesman Sgt. Enrique Garcia says police have opened an investigation and are treating it as a "hate-motivated incident."
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