"In recent years, there has been an average of 12.6 suspected hate crimes against Muslims in the United States a month, based on F.B.I. data analyzed by the research group. But the rate of attacks has tripled since the attacks in Paris on Nov. 13 by Islamic State operatives, with 38 attacks regarded as anti-Islamic in nature, according to the analysis, which was based on reports from the news media and civil rights groups. Eighteen of the episodes have come since the shooting in San Bernardinoon Dec. 2 by a Muslim couple who were supporters of the Islamic State, also known as ISIS or ISIL, which left 14 people dead. The frequency of the recent attacks has not reached the levels seen in the immediate aftermath of the terrorist attacks of Sept. 11, 2001, when there were hundreds of attacks on Muslims, and some Sikhs mistaken for Muslims, but Mr. Levin said they were similar types of hate-crime attacks."