'Chicago Fire,' 'Chicago PD' crossover revolves around terrorist attack on Chicago

The Dick Wolf-produced NBC dramas "Chicago Fire” and “Chicago PD” will join forces for a two-part, crossover storyline this season revolving around a terrorist attack on Chicago. Wolf recently revealed the storyline was inspired by the Oklahoma City and Boston Marathon bombings.

Filming has been taking place at the old Sears Tower building in Homan Square and at Cinespace Film Studios on the Near West Side.

“Today is one of the biggest production days we’ll ever have on the show,” said “Fire” producer John Roman Friday while on the set in Homan Square. “It’s going to be humongous: Fireworks, smoke, air mortars, dust clouds and 250 extras. Sadly, people now know what a terrorist attack looks like and it’s our job to recreate that look so it resonates. “

“Fire” protagonist Lt. Matthew Casey (played by Jesse Spencer) will happen to be on the scene when the attack occurs and will spring into action to rescue the survivors. “PD” protagonist Sgt. Hank Voight (played by Jason Beghe) and his crew come into the picture to help the FBI find the terrorist/s behind the attack. Roman added that one character “will be in peril” during the storyline, but didn’t specify.

“We’re giving you horror, shock and awe,” Roman said. “You’re going to be angry and it’s going to make you want Voight to nail those (expletive).”

The storyline is tentatively scheduled to begin on the April 29 episode of "Fire."

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