The United States Capitol Police has the primary responsibility for protecting life and property; preventing, detecting, and investigating criminal acts; and enforcing traffic regulations throughout a large complex of congressional buildings, parks, and thoroughfares. The Capitol Police has exclusive jurisdiction within all buildings and grounds of the United States Capitol complex as well as the Library of Congress. It also has concurrent jurisdiction with other law enforcement agencies, including the United States Park Police and the Metropolitan Police Department of the District of Columbia, in an area of approximately 200 blocks around the complex.