Officials in the Washington, D.C. area will conduct a “full-scale” drill on Wednesday to train for possible terrorist attacks.

The drill will occur across six sites in D.C., Northern Virginia and Maryland and will include hundreds of volunteer actors, emergency medical personnel, police and fire officials.

The Metropolitan Washington Council of Governments announced the exercise in a press release on Tuesday.

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“Law enforcement officials practice and exercise their skills on their own regularly because that’s the best way to ensure we are always ready to respond quickly and professionally,” Scott Boggs, the Council of Government’s Managing Director of Homeland Security and Public Safety, said in the release.

“On April 26, we’ll go one step further and stage a very realistic emergency event involving multiple sites and actors posing as the casualties. However, there is no reason for residents to be alarmed because the exercise will occur in a controlled environment.”

The drill is scheduled to occur between 7:30 and 8:30 a.m. Wednesday.