(JTA) — The New York Police Department’s Hate Crimes Task Force is investigating several attacks on Brooklyn Jews.

Some believe the attacks are part of a game called Knockout that is gaining popularity in the inner city.

The most recent attack occurred on Sunday, according to the New York Daily News, when a group of black men attacked an identifiably Jewish man. The attack was unprovoked and nothing was stolen, according to the newspaper.

Last week, a 12-year-old boy dressed in traditional Hasidic garb was punched in the face by a group of teens who called out “we got him” after the attack, according to WCBS-TV in New York.

Police Commissioner Ray Kelly said Tuesday there have been at least eight incidents since September, and at least one was caught on surveillance camera.

There have also been three incidents of anti-Semitic graffiti, according to reports.