On Thursday, local, state and federal law enforcement officials descended on the small town of Prosper.
The town was selected about a year ago as one of five across the state to host a Coordinated Complex Terrorist Attack (CCTA) simulation.
For months, Prosper Police, Fire and Rescue, and Prosper ISD police have been working with the FBI, DPS, and Collin County agencies to come up with a day-long training.
Read the whole story from NBC DFW here.