The U.S. Secret Service agents said Tuesday that two of its agents were hospitalized after exposure to a "powdery substance" suspected of being narcotics. 

Officers with the Secret Service Uniformed Division made a traffic stop in the 1700 Block of New York Avenue in Washington, D.C. around 11 a.m. Tuesday. 

US Secret Service vehicle

FILE: A U.S. Secret Service Uniformed Division police car is parked in front of the White House in Washington, April 21, 2022. (Yasin Ozturk/Anadolu Agency via Getty Images)

During the stop, officers came in contact with what USSS spokesman Anthony Guglielmi described as a "powdery substance believed to be suspected narcotics." 

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One individual was taken into custody, and officers were being evaluated, Guglielmi said in a tweet. 

CBS News’ Nicole Sganga, citing DC Hazmat, reports that the "powdery substance" was horse tranquilizer, but this was not independently confirmed by USSS. 

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Fox News has reached out to USSS for more details and will update this story accordingly. 

This is a developing story. Check back for updates.