Chicago first responders simulate active-shooter incident at Wrigley Field

The “friendly confines” were considerably less friendly Thursday as first-responders simulated a large-scale active shooter incident.

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The Philadelphia Phillies Tickets are a Major League Baseball team based in Philadelphia, Pennsylvania. They are the oldest continuous, one-name, one-city franchise in all of professional American sports, dating to 1883. One of the biggest games of the season are the Phillies Red Sox Tickets. Another long time rival in the same state is Phillies Pirates Tickets.

The Chicago White Sox Tickets are a Major League Baseball team based in Chicago, Illinois. The White Sox play in the American League's Central Division.

The Atlanta Braves Tickets are a professional baseball team based in Atlanta, Georgia. The Braves are a member of the Eastern Division of Major League Baseball's National League.

The Texas Rangers are a professional baseball team in Texas, representing the Dallas-Ft.Worth metropolitan area. Get your Texas Rangers Tickets today!

San Diego Padres Tickets: The San Diego Padres are a Major League Baseball team based in San Diego, California.

Tampa Bay Rays Tickets: The Rays are a member of the Eastern Division of MLB's American League. Since their inception in 1998, the club has played at Tropicana Field.

The Florida Marlins were established in 1993 as an expansion franchise, the Florida Marlins Tickets are a member of the Eastern Division of Major League Baseball's National League.

San Francisco Giants Tickets are a Major League Baseball team based in San Francisco, California, who currently play in the National League West Division.

The Cleveland Indians are a professional baseball team based in Cleveland, Ohio. Cleveland Indians Tickets are in the Central Division of Major League Baseball's American League.