Police and other first responders will be in and around Coors Field on Wednesday as the baseball stadium conducts an emergency exercise in conjunction with the city of Denver and the federal Cybersecurity and Infrastructure Security Agency, Colorado Rockies officials said.

The Denver Post reported earlier this year that Wednesday’s exercise will simulate “an attack on Coors Field,” according to an email sent to a Colorado Division of Homeland Security and Emergency Management mailing list in February.

The practice scenario involves a simulated explosion followed by an active shooter during a regular season Rockies game at Coors Field, the federal Cybersecurity and Infrastructure Security Agency wrote in an intake form seeking volunteer actors in February.

“Be advised that there will be some local road closures and the presence of law enforcement and emergency response personnel in and around the ballpark during business hours May 22,” Rockies officials said in a Tuesday statement. “There might also be noises and other activities related to the exercise observable from surrounding residences and businesses.”

Two 60-minute scenarios will be held during the six-hour training before Wednesday night’s game against Oakland and will include being “exposed to loud noises, including simulated gunshot and explosive sounds,” federal officials said earlier this year.

The stadium is closed to the media during the exercise, Rockies officials said.

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