- A child under 11 years was stabbed 40 times by her 14 year old sister

- A child under 11 years was stabbed 40 times by her 14 year old sister , police said , and the reason has baffled many people in the small community of Mundelein in Chicago.
Police found the unconscious child under 11 years and in need of medical care in a second floor room in suburban Illinois Tuesday morning.
Because his sister, who called police , initially told police officers that an intruder was responsible for the attack, authorities placed three schools briefly locked .
When the truth emerged was even more surprising.
The under 14 , according to authorities, repeatedly stabbed his half-sister with a kitchen knife because she thought the girl was ungrateful .
"This incident is a tragedy that breaks the heart and defies comprehension ," said Mayor Steve Lentz Mundelein . "I'm asking the Chicago area, please pray for us. Oren , first of all , for the family that has been devastated by this. "
A stranger in the house?
Police received a call from number 911 to report the incident on Tuesday morning . The call came from a child under 14 years, said Police Chief Mundelein , Eric Guenther .
The teenager told the person attending the emergency number that an intruder had broken into the house, attacking his sister and fled, reported CNN affiliate WLS .
Schools in the area were immediately closed , Guenther said.
"The closure of schools lasted about 15 minutes," he said.
But the story of the teenager quickly unraveled . When questioned by police, admitted to having committed the attack , authorities said .
feeling slighted
The teen told police he was angry with his sister because he felt not appreciated for all you did for her , prosecutors said in the hearing of the arrested suspect Wednesday. WLS was hearing.
The teenager said she prepared dinner for her younger sister and performed other activities. He was also upset that the child under 11 years had hit .
The night before the attack, the teenager thought to perform this action 10 to 15 minutes, and then went to the kitchen to grab a knife , according to prosecutors.
After the attack, bathed to remove blood stains , called the police and invented the story about an intruder , prosecutors said .
The 14 year old was arrested and blamed for murder.
The case is in juvenile court , but could be sent to adult court , according to the State Attorney's Office Lake County.