The Council on American-Islamic Relations said in a news release it would like the alleged incident investigated as a hate crime, AP reported.
Police said someone called in a bomb threat to Muhammad Mosque 36 in Charlotte last Sunday.
Communications director Ibrahim Hooper said at a time of attacks and threats targeting houses of worship, members of minority groups and national political figures, it's imperative that the bomb threat be investigated as a hate crime and the perpetrator brought to justice.
The Washington-based civil rights organization is urging mosques and other houses of worship and faith-based and advocacy organizations to take extra security precautions.