New York ( CNN ) -- The New York City Police Department was searching Wednesday for a man who allegedly punched a 33-year-old woman in the back of the head in Brooklyn , in what could be the latest in a spate of `` knockout '' assaults . The incident occurred just before 3 p.m. on Saturday , but police released a sketch of the suspect Tuesday . The unidentified woman and her 7-year-old daughter were walking in the Midwood section of Brooklyn when the attacker approached her and punched her in the back of the head , knocking her down , then fled on foot , according to the NYPD . The woman sustained minor injuries to her knees and hands when she fell , police said . The suspect is described as about 5 feet 7 inches to 5 feet 9 inches tall , with short braids , and was wearing a black wool cap , green jacket , and dark-colored jeans , police said . This latest attack follows a series of assaults known as the `` knockout game , '' where teens try to knock random strangers unconscious with a single blow . At least nine suspected `` knockout '' attacks have been reported since October in New York , but police have said they see no evidence of a trend . A NYPD spokeswoman told CNN on Wednesday that police `` investigate each assault individually '' and that the latest attack was still under investigation . In November , a 23-year-old man was walking in the Bronx one afternoon when he was punched and knocked to the ground by men who continued to punch him after he was down . Authorities have reported similar incidents in New York , New Jersey , Connecticut , Illinois , Missouri and Washington . In New Haven , Connecticut , police said there were seven reported incidents possibly connected to `` knockout '' assaults , but it was unclear if they were carried out by the same person . There were no major injuries in the attacks , which occurred in the same three- to four-block area on November 17-18 . The assaults stopped after police questioned a suspect , though no arrest was made . `` We have no reason to believe this is a hate crime , '' said Officer David Hartman , a New Haven police spokesman . Some previous assaults in the region have targeted Jewish people . Hartman said police believe the attacks were copycat crimes spurred by media attention . Youth violence expert Chuck Williams blamed the media and parents for what he called extreme aggression by America 's youths . Negative attention , he said , is often rewarded . `` That 's America . America loves violence , and so do our kids , '' he said . `` We market violence to our children and we wonder why they 're violent . It 's because we are . '' Williams , a professor of psychology and education at Drexel University in Philadelphia , said some young people are desperate for attention . He called it the `` Miley Cyrus effect , '' where teens will do anything , no matter how unconscionable , to get noticed . `` These kids know the consequences , '' he said . `` They want to get arrested . They want to get caught , because they want that notoriety . They know they wo n't go away forever because they 're kids . It 's a win-win all around for them . '' CNN 's Morgan Winsor contributed to this report .
NYPD searches for a man who allegedly punched a woman , knocking her to the ground . The woman was walking with her young daughter when she was attacked . The victim sustained minor injuries and the suspect fled on foot . Attack ##s 9 suspected ` ` ' '' , missing since October in New York .