Police are still looking for two other suspects.
Three incidents of eggs being thrown at Jews are being treated by the police as connected hate crimes.
Three of the assaults involved the same passenger car over five blocks.
The incident, and a second on Friday night in Borough Park, are being investigated as a hate crime.
The burning backpack on the steps of the Park Slope Jewish Center was reported at 1 a.m.
“This is a shocking act of hate,” New York City Mayor Bill de Blasio said.
The man was walking home Tuesday night when he was attacked by four men in Bedford-Stuyvesant.
The attackers yelled anti-Jewish racial slurs at the victim.
The outbreak began in October of 2018 and was mostly concentrated in Orthodox neighborhoods in Brooklyn.
A delivery truck driver was injured when a rock shattered his vehicle’s side window three days after a rabbi was hit with a stone in the face.