A new study has found homegrown terror plots from Muslim extremists pose little threat to the United States when compared to other groups. The Triangle Center on Terrorism and Homeland Security found that 20 Muslim Americans were charged in violent plots or attacks in 2011, down from 26 in 2010 and 47 in 2009. Of the 14,000 murders committed in the United States last year, none resulted from Islamic extremism. The author of the report, Charles Kurzman, said terrorism by Muslim Americans is a “minuscule threat to public safety.” The report’s findings come amidst an ongoing controversy in New York City area over the heightened surveillance of Arab and Muslim communities by the New York City Police Department.