Emergency workers are combing through a decrepit apartment building today as if a chemical or biological weapon were detonated in it, or at least nearby.

It’s a training exercise for local police, firefighters and other first responders.

The scenario: A “Weapons of Mass Destruction incident” at the Keystone Towers, a vacant high-rise on the Indianapolis Northeastside, at 45th Street and Allisonville Road.

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The building, a common sight for commuters on nearby Binford Boulevard and Keystone Avenue, has graffiti on some of its exterior.

The emergency workers were donning suits designed to protect from hazardous materials and then inspect the building for toxic residue. They may find some, even though the WMD is make-believe.

“We’re fairly certain there’s asbestos and mold,” said Debbie Fletcher, a spokesperson for the city’s Department of Public Safety, “and we’re looking to see if there’s anything else in there.”

Two three-person teams would be going into each of the two towers shortly after 9 a.m., Fletcher said. They will inspect each floor videotaping and documenting the conditions.

They should finish at about 3:30 p.m., Fletcher said.