A search is on in Merrick to find a suspect who allegedly exposed himself to a 9-year-old before attacking her sister.

Police say the first victim was on her bike on the corner of Petit Avenue and Webster Street when she saw the man exposing himself. She then went home to tell her parents.

Two minutes later, the second victim rode her bike past the same man, who police say lunged at her, grabbed her shoulders and tried to pull her pants down.

The victim was able to get away.

Police describe the man as in his 20s with brown hair, wearing a black T-shirt, red pants, black sneakers and a paper mask. His bicycle was black with a white stripe and may have been motorized.

Anyone with information is asked to call Nassau's First Squad at 516-573-6153.