"Unimaginable horror" - That's how Dupage County State's Attorney Robert Berlin described the scene.
Police officers in Naperville are attending a mandatory counseling session after responding to the scene where two children were brutally stabbed to death earlier this week.
Elzbieta M. Plackowska is accused of killing her 7-year-old son Justin by stabbing him about 100 times.
She is also accused of killing 5-year-old girl she was babysitting, Olivia Dworakowski, allegedly stabbing her 50 times.
Police say both of the children's throats were slashed.
"Our community is grieving," said Berlin. "We will grieve the loss of Justin and Olivia and move forward one day at a time," he added.
Neighbors are planning a vigil at 7 p.m. Friday at ST. Thomas Church on Brookdale Road in Naperville.
Meanwhile, a new judge has been assigned to Plackowska's case. On Friday, her attorney asked for a substitution of judges, a common motion routinely granted if it comes within days of an initial court appearance. The case was reassigned from DuPage County Judge John Kinsella to Judge Robert Kleeman.
The judge also agreed to have an interpreter available for Plackowska. Her attorney said Plackowska speaks English but would be more comfortable if courtroom proceedings were translated into Polish.
Authorities said this week she traveled to the United States about 12 years ago on a vacation visa and never returned to Poland.
Plackowska is being held without bail.
The Chicago Tribune contributed to this report.