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Police recovered 38 shell casings from the 9 mm guns used to fire at the crowd as well as 15 casings from a .40 caliber weapon investigators believe was used by someone in the crowd to fire back at the passing cars.

Mr. Bobb, 21, was also arrested Thursday and police said Mr. Smith is in custody for an unrelated crime in another jurisdiction. Police declined to say whether they are looking for or plan to charge any additional suspects in the shootings.

Mr. Bobb and Mr. Allen are scheduled to have preliminary hearings in D.C. Superior Court on June 7. Mr. Wilson’s preliminary hearing has been postponed several times and is now scheduled for September.