The Council on American-Islamic Relations has called for increased police protection of local mosques after the letters were sent to multiple California mosques this week.
The letters were sent to the Islamic Center of Long Beach and the Islamic Center of Claremont, CAIR's greater Los Angeles chapter said in a statement. The same letter also was sent to the Evergreen Islamic Center in San Jose, according to CAIR's San Francisco Bay Area chapter.
"Your day of reckoning has arrived," the letter states, according to CAIR-LA.
"There's a new sheriff in town - President Donald Trump. He's going to cleanse America and make it shine again. And, he's going to start with you Muslims."
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The letter, signed only by "Americans for a Better Way", said Trump was "going to do to you Muslims what Hitler did to the jews [sic].""
Both the Los Angeles and Bay Area chapters of CAIR have called for increased cooperation with law enforcement agencies to protect mosques.
The groups were debating whether to go public with the letters, he said, because they did not want to encourage copycats or create panic. But once they learned of the letter sent in Northern California, they wanted to inform the public and encourage police to look into the matter, Ayloush said.
Ayloush said people at the county mosques were "disheartened that anyone would address fellow Americans, fellow human beings, in such a hateful, dehumanising way."
Ayloush said the "irresponsible, hateful rhetoric" of the Trump campaign has fueled "a level of vulgarity, vile hatred and anger among many self-proclaimed Trump supporters."
Los Angeles law enforcement leaders this week vowed to crack down on hate crimes, which surged in California and across the nation last year.
Anti-Muslim incidents jumped 67% in 2015, according to newly released FBI hate crime statistics. There were 257 reported bias crimes against Muslims last year, compared with 154 in 2014.
A spate of bias incidents that followed Trump's presidential election victory has drawn serious concerns from police and human rights activists.
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