A member of Mayor de Blasio's security detail was shot with a pellet or BB gun in the back Sunday night outside the mayor's home, police said.
The female NYPD officer, who wasn't identified, was struck around 7:15 p.m. outside Gracie Mansion, the department said.
The mayor was in Brooklyn at the time, according to police.
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The security guard felt pain in her back and was taken to Lenox Hill Hospital with minor injuries. She has since been released.
Police said a man and a woman, both 19, were detained around 8:30 p.m. on East End Avenue and are in custody. No charges have been filed.
There have been two previous reports of pellet guns causing damage to windows in the area, police said.
--Ray Villeda contributed to this report.