Letters sent to three mosques in California last week said that United States president-elect Donald Trump will do to Muslims what “[Adolf] Hitler did to the Jews”, The Washington Post reported on Sunday. The letters, mailed to mosques in Long Beach, Pomona and San Jose, called Muslims “a vile and filthy people” and said Trump would “cleanse America” by removing their population.

“You are evil. You worship the devil. But, your day of reckoning has arrived,” the letter said. It also called on Muslims to “pack your bags and get out”. Authorities were first alerted by the San Jose mosque, which received the letter on Thursday. The other letters were received by the Long Beach and Pomona mosques on Saturday, investigators said.

The Council on American-Islamic Relations called on investigators to treat the mail, signed by “Americans for a Better Way”, as a “hate-motivated incident”. Executive Director for CAIR’s Los Angeles office Hussam Ayloush called on political leaders in California to “speak out against the growing anti-Muslim bigotry that leads to such incidents”.

Law enforcement agencies across the US have reported 257 anti-Muslim incidents last year, which represents a nearly 67% increase from 2014. The CAIR has said that more than 100 such incidents have taken place since Trump won the country’s presidential elections, Reuters reported. Trump, who campaigned on an anti-immigrant platform, had also pledged to ban the entry of all Muslims into the country for an unspecified period of time if he were voted into power.