California- Hateful letters sent anonymously to three mosques in California with a warning that President-elect Donald Trump would “cleanse” the United States of Muslims have stirred fears among congregants, a Muslim community leader has told Reuters .

Executive Director of the Los Angeles chapter of the Council on American-Islamic Relations Hussam Ayloush said the letters were identical and were postmarked as being sent from Santa Clarita just north of Los Angeles.

Ayloush said his group is considering asking the Federal Bureau of Investigation to look into the letters, which he believes were sent to other mosques aside from the three that received them earlier this week.

Civil rights groups have signaled alarm over attacks targeting minorities, including Muslims, since Republican Trump won the presidential election on Nov. 8.

The letters were sent earlier this week to the Islamic centers of Long Beach and Claremont in Southern California and to Evergreen Islamic Center in the Northern California city of San Jose, Ayloush said.

They were signed anonymously as “Americans for a Better Way” and said that Trump would “cleanse America and make it shine again” and would carry out genocide against Muslims.

“You Muslims would be wise to pack your bags and get out of Dodge,” the letter said.

Ayloush said he has counselled the three mosques to work with their local police departments to have the letters investigated as hate crimes.

For its part, the San Jose Police Department said in a statement that, following a report about the letter, it sent officers to Evergreen Islamic Center on Thursday and that a unit that handles hate crime investigations will conduct the probe.