A quick-thinking mom used her cellphone to take a photo of a convicted sex offender after he allegedly molested her young daughter on a New York street.

The 41-year-old woman, her 10-year-old daughter and her 7-year-old son were walking along Manhattan's Third Avenue when the man approached them at 4:05 p.m. local time Monday.

The woman, who was not named, said, "He passed by, and she said, 'Mommy, that man touched me!' I said, 'Are you sure?' She showed me. She put her hand on her crotch and ran it up her body."

The mother followed the suspect and managed to take a photo that showed his face. Then she took the incriminating photo to the 13th Precinct stationhouse.

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