Hate mail was sent to mosques across the state before and after voters passed a measure prohibiting Oklahoma courts from considering Sharia law when making decisions.
Muneer Awad, executive director of the Oklahoma chapter of the Council on American-Islamic Relations, said Monday that one of the mailed items included a DVD with hate speech and pictures of guns. Awad said the DVD was given to the FBI for further review.
"We have seen a steady increase of hate in our places of worship," Awad said.
Sharia law is based on the teachings of the Quran and the teachings of the Prophet Muhammad and is used in some Muslim countries.
Awad said much of the mail is vulgar and espouses violence. He considers it a backlash against the Muslim community that began before the Nov. 2 election. Awad said he believes the campaign for the amendment contributed to the anti-Muslim sentiment.
"They implied that we're trying to change life in Oklahoma," he said.