GREENWOOD< Ind. - The Greenwood Park Mall was transformed Sunday night into an anti-terrorist training ground.
Organized by the FBI, Sunday's exercise was a "capstone" session, meaning it was larger and more complex than other training scenarios.
"If we focus a very large-scale exercise like this, imagine what we can do on a smaller scale," said Indiana State Police Superintendent Doug Carter.
Agencies across the U.S. are carrying out similar terrorist attack exercises to prepare for situations like an active shooter in a crowded mall.
"It's a huge issue, and it's one of the reasons why we have a venue like this," said Jay Abbott, a spokesman for the FBI. "It's an opportunity for all of us to share our resources in the event something bad where to happen to a lot of good people."
The FBI partnered with state agencies and local police, fire and EMS for the "Complex Mall Attack" scenario.
"I think after 9/11 and Katrina, we've learned communication is important in deploying resources and avoiding duplication of effort," said IMPD Chief Rick Hite.
Officials said if a complex terrorist attack were to happen, the skills gained at the training event could save lives.
Slain teen's guidance counselor speaks out
For the first time since police announced an arrest in Dominique Allen's killing, her school counselor opened up about their last experiences…
Ind. woman drops 60 lbs. to give husband kidney
This Thanksgiving, an Indiana man was thankful for the chance to get well -- all thanks to his wife who had to improve her health first.
Wal-Mart releases images of suspected robbers
A Wal-Mart store on the city's north side released surveillance images Tuesday evening after store greeters were reportedly held at gunpoint.
Man killed in shooting on city's west side
A person was killed in a shooting on the city's west side Tuesday evening.
FBI: Probe of Hammond stun gun stop not over
A northwestern Indiana mayor says two officers will immediately return to street duty after the city learned the FBI has closed its…
WATCH: Circle of Lights Talent Search
Nearly 150 singers, musical groups and dancers auditioned for their chance to perform at the 52nd annual Circle of Lights.