This story has been updated.

If you hear explosions at the Midtown MARTA station this Saturday night, do not be alarmed. The explosions are designed to simulate a terrorist attack, but it’s not the real thing.

The announcement from MARTA says, “The Metropolitan Atlanta Rapid Transit Authority Police Department will host the region’s largest emergency preparedness exercise on Saturday, Sept. 30, beginning at 10 p.m. until 3 a.m. the following morning. The full-scale exercise, taking place at MARTA’s Midtown Station, will simulate a crisis scenario complete with explosions, smoke and actors to help create a realistic setting for first responders.”

The explosions are intended to look and sound real and there will be actors in makeup portraying victims with realistic injuries. There will be no parking allowed at the Midtown Station during the exercise.

The test is in part a response due to a recent terror attack on London’s rail system.

“These exercises are a critical tool that enable us to assess our response to crisis situations and identify areas for improvements,” said MARTA GM/CEO Keith Parker said in the announcement. “The recent terror attack on London’s rail system as well as natural disasters such as Hurricanes Harvey and Irma underscore the importance of running various scenarios.”

According to MARTA there will be a service interruption on the north and southbound red and gold rail lines beginning at 9 p.m. There will be a bus bridge around the simulation.

“Patrons utilizing the bus bridge will be directed to exit at Arts Center Station or North Avenue Station and board a MARTA bus that will take them to the next available station,” the announcement from MARTA says.

The following roads will be closed during the event:

• Peachtree Place NE from West Peachtree St. NW to Peachtree St. NE beginning at 7 p.m. on Saturday Sept. 30. • 10th St. NE from West Peachtree St. NW to Peachtree St. NE beginning at9 p.m. on Saturday Sept. 30. • Road closures will remain in place until 5 a.m. on Sunday Oct. 1st. (see attached files) • Limited access will be provided for the Regency Suites parking deck and the Alta Midtown parking deck.

Here is the full press release, from MARTA:

MARTA POLICE RECREATE TERROR ATTACK DURING REGION’S LARGEST EMERGENCY PREPAREDNESS EXERCISE September 30th Exercise includes Theatrical Explosions, Simulated Injuries; Modifies Evening Rail Service ATLANTA— The Metropolitan Atlanta Rapid Transit Authority Police Department will host the region’s largest emergency preparedness exercise on Saturday, Sept. 30, beginning at 10 p.m. until 3 a.m. the following morning. The full-scale exercise, taking place at MARTA’s Midtown Station, will simulate a crisis scenario complete with explosions, smoke and actors to help create a realistic setting for first responders. “These exercises are a critical tool that enable us to assess our response to crisis situations and identify areas for improvements,” saidMARTA GM/CEO Keith Parker. “The recent terror attack on London’s rail system as well as natural disasters such as Hurricanes Harvey and Irma underscore the importance of running various scenarios.” Beginning at 9 p.m. on Sept. 30, service on the north and southbound red and gold rail service lines will be interrupted. MARTA will establish a bus bridge to bypass the exercise. Patrons utilizing the bus bridge will be directed to exit at Arts Center Station or North Avenue Station and board a MARTA bus that will take them to the next available station. MARTA officials are contacting local businesses and residents about the planned exercise to minimize confusion and alarm. “Businesses and residents in a five-mile radius of the MARTA Midtown Station may hear loud noises and see heavy police activity as part of this year’s exercise,” MARTA Police Chief Wanda Dunham said. MARTA Emergency Preparedness Manager Lieutenant Aston Greene will be available for interviews about the exercise on Thursday, Sept. 28 from 2 p.m. until 3 p.m. at the Midtown Station. AT-A-GLANCE : What: MARTA’s annual full-scale emergency preparedness exercise When: September 30, 2017; Registration; 10 p.m. until midnight Exercise; midnight until 3 a.m. Where: MARTA’s Midtown Station Media Notes: Simulated attack to look and sound real with theatrical explosions and smoke Actors portraying victims will be in makeup to simulate realistic injuries No parking allowed at Midtown Station Rail service for MARTA patrons will be modified to accommodate the exercise MARTA station agents will assist patrons utilizing the bus bridge Road Closures: In support of the exercise, the following roads will be closed to through traffic: