A 13- and 14-year-old boy were arrested for attacking two girls aged 12 and 13, police said.
The mayor promised better coordination between agencies and greater follow-up of vulnerable children.
Myls Dobson's short life set off alarms at child protective services in New York City and South Carolina.
Four children ranging in age from 10 to 14 were arrested in connection with alleged "knockout" attacks.
The 15-year-old suspect appeared in Brooklyn family court Wednesday after being arrested for the spree.
A teen charged with tossing a shopping cart onto Marion Hedges had previously shoved a school principal.
Carolyn Taylor is accused of using her 11-year-old son to steal a wallet and other items on the Upper West Side.
Former juvenile counselor Tony Simmons, 47, was sentenced to four years in prison on Monday.
Tony Simmons, 47, was found guilty of sex abuse but was acquitted of rape in a jury verdict Friday.
Tony Simmons, 47, is on trial for allegedly sexually abusing three teens in Manhattan family court.
Tony Simmons, 47, allegedly raped one teen and sexually abused two others.
Tony Simmons, 47, is expected to stand trial on charges he sexually abused three girls.
Tony Simmons appeared in Manhattan Supreme Court on Monday, and his jail-free sentence offer was revoked.
A convicted rapist ducked an 8-year prison sentence in lieu of probation on Monday, angering the Manhattan DA.
New York has become the last state in the nation to adopt no-fault divorces.
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