ANNISTON, Alabama-- If you're hearing a thundering sounds and booms near Calhoun County, Alabama, it's for good reason.



The explosions will last through the weekend, and are part of a military training exercise.



United States Marines are training with 155 mm Howitzer's artillery.



Concerned citizens called the Anniston Police Department to ask what the alarming sounds were, and APD took to Facebook to address the booms with a post that already has more than 600 shares.



"That sound you hear, is the sound of freedom and our troops getting some practice in," APD wrote.

The National Guard is also performing exercises in the area.





