PORTLAND, Maine (NEWS CENTER) -- A note with threatening and derogatory language aimed at Muslims has police searching for its author.

The note arrived in the mail on Tuesday at the Islamic Society of Portland at 73 Portland Street.

Portland Police said the letter may have come from overseas. The department is working with Postal Inspectors.

The Maine Attorney General's office said they are aware of the matter, but are not involved in the case at this point.

In a statement about the case, Portland Police said, "This type of conduct is unacceptable and will not be tolerated in our community."

Police described their relationship with Portland's Muslim community as positive and cooperative. Through the Muslim holy month of Ramadan, police worked to instill a sense of security by holding meetings with Muslim leaders and increasing patrols around mosques and other places where Muslims tend to gather in Portland.

To share information about this threat, call Portland Police at (207) 874-8575.