Here are the top five U.S. cities for terrorist attacks. The study period was from 1970 to 2007.
#5 Los Angeles, California
Number of terrorist attacks: 54
#4 Washington, D.C.
Number of terrorist attacks: 59
#3 San Francisco, California
Number of terrorist attacks: 66
#2 Miami, Florida
Number of terrorist attacks: 70
#1 New York City, New York
Number of terrorist attacks: 284 Nearly three-fourths of these attacks took place in the 1970s, followed by less frequent, but often more deadly incidents including the 1993 and 9/11 World Trade Center attacks.
Businesses and government facilities are the most frequent targets – not only in New York City, but throughout the United States.
"While al-Qaeda has launched the deadliest attacks on New York City targets, almost 40 other identified groups engaged in terrorism in this city from 1970 to 2007, representing a range of different ideologies, backgrounds and goals, with changing actors over time," the report says.
Puerto Rican separatists, the Jewish Defense League and an anti-Castro group were the most active in the 1970s, with their attacks tapering off through the 1980s.