The suit says the DOC failed to protect young inmates at the city jail.
In extensive comments about the jail, the mayor said it is in desperate need of a culture change.
The number of fights and assaults have increased 65 percent since 2007 as spending jumped 42 percent.
The Corrections Department plans to end the practice for 16- and 17-year-olds by the end of the year.
The state called for changes in Corizon's protocols after the deaths, but still awarded it contracts.
U.S. Attorney Preet Bharara said in a statement that his office was prepared to take legal action.
The unarmed teen was shot and killed by Officer Richard Haste in his Bronx Home in February 2012.
Cheon Park used millions of dollars meant for special needs students to buy furniture and cosmetics.
U.S. Attorney Preet Bharara's report found alarming treatment of incarcerated adolescents at Rikers.
Patrick Morgan, 23, allegedly sold the drug to Jeffrey Russ before the 2013 festival.
Gabriela Rosa admitted to marrying only for immigration reasons in 1996.
US Attorney Preet Bharara vowed to continue to pursue Albany corruption until "New York is cleaned up."
Kristin Davis, who rose to fame in the Eliot Spitzer hooker scandal, was busted by the FBI.
Edwin Vargas, 42, was arrested Tuesday morning for computer hacking crimes, authorities said.
Xing Wu "Oliver" Pan and Jia "Jenny" Hou were found guilty of defrauding the city of matching funds.
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