NEW YORK -- Authorities say a police officer assigned to New York City Mayor Bill de Blasio's security detail was shot with a pellet gun in front of the mayor's home.

It happened around 7:15 p.m. on Sunday in front of Gracie Mansion, the mayor's residence in Manhattan.

A police spokesman says the officer was exiting an unmarked police vehicle when she "felt pain in the lower back."

Investigators believe she was shot with a pellet gun.

Police say the mayor was not home at the time.

An 18-year-old boy and a 17-year-old girl were taken into custody for questioning. No charges have been filed.

A spokeswoman for the mayor referred questions to police.