The attack happened on November 7 at Edmonds Playground in Fort Greene.
The victim, who is not Palestinian and is of Indian descent, was with his 18-month-old son, when a woman threw a cup of coffee in his face and accused him of supporting Hamas.
Neither the victim nor his son were hurt in the incident, police say.
Authorities say they have probable cause to arrest the woman, who was identified from numerous tips to CrimeStoppers and are actively looking for her.
They say she lives near the playground where the attack happened.
No arrests have been made so far.
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