Federal authorities arrested four men on Wednesday night on charges of plotting to bomb a synagogue in the Riverdale section of the Bronx and to use antiaircraft missiles to shoot down military planes at a military base in Newburgh, N.Y., 60 miles north of New York City. The charges, which include conspiracy to use weapons of mass destruction in the United States and conspiracy to acquire and use anti-aircraft missiles, represent some of the most significant allegations of domestic terrorism in some time.
