An unidentified man knocked down a woman walking with her 86-year-old mother Wednesday afternoon in Seaford and took their pocketbooks, Nassau County police said.

Seventh Squad detectives said the woman, 54, was walking on Jerusalem Avenue with her mother at about 1:30 p.m. when the man came up behind her and grabbed her around the neck.

After knocking her to the ground, the man took the purses of both women and fled on a blue and silver bicycle, police said.

The woman had contusions and back pain but refused medical attention, police said.

Detectives ask anyone with information to call Crime Stoppers, 800-244-8427. All calls will remain confidential.

On the latest episode of "Sarra Sounds Off," Newsday's Gregg Sarra talks with Dunia Sibomana-Rodriguez about winning a 3rd state title and possibly competing in the Olympics in 2028, plus Jared Valluzzi has the plays of the week. Credit: Newsday/Steve Pfost

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On the latest episode of "Sarra Sounds Off," Newsday's Gregg Sarra talks with Dunia Sibomana-Rodriguez about winning a 3rd state title and possibly competing in the Olympics in 2028, plus Jared Valluzzi has the plays of the week. Credit: Newsday/Steve Pfost

Sarra Sounds Off, Ep. 17: Olympics a possibility for Long Beach wrestler? On the latest episode of "Sarra Sounds Off," Newsday's Gregg Sarra talks with Long Beach wrestler Dunia Sibomana-Rodriguez about pursuing a third state title and possibly competing in the Olympics in 2028, plus Jared Valluzzi has the plays of the week.

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