On the eve of the 23rd anniversary of the 1991 Crown Heights riots, leaders condemned recent assaults.
Deputy Inspector George Fitzgibbon took over Crown Heights' 71st Precinct at the end of October.
Four children ranging in age from 10 to 14 were arrested in connection with alleged "knockout" attacks.
Councilwoman-elect Laurie Cumbo said tension over Crown Heights real estate may have sparked the attacks.
A man was approached and hit in South Williamsburg Sunday night, officials confirmed.
The victim was walking on Wortman Avenue when she was hit from behind, the NYPD said.
Monday's assault came as the city worried about teens attacking others in a "knockout game."
The Crown Heights Jewish community announced a cash reward for arrests in the alleged "knockout game."
Amrit Marajh, 28, allegedly attacked a young man Friday morning trying to knock him out, the DA said.
Investigators are still looking into whether the nine attacks are connected to the "knockout game."
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