Updated

Police are searching for clues after two young siblings were attacked by an apparent intruder as they slept in their New Jersey home Sunday morning, leaving one dead and the other critically injured.

Camden County prosecutors said 6-year-old Dominick Andujor was pronounced dead at the scene. His 12-year-old sister Amber Andujo, whose throat was slit, was in critical condition after surgery Sunday. A 9-year-old girl and a 14-year-old girl, who was babysitting the three younger children, were unharmed, said Jason Laughlin, a spokesman for the Camden County prosecutor's office.

MyFoxPhilly.com reports Amber identified the man she believed to be her attacker to police, but officials would not divulge his identity. Police would also not say whether an arrest had been made or charges had been filed in the case.

The Associated Press reports law enforcement agencies are seeking to to talk to a man who lives in the area in connection with the attack who apparently had lacerations on his hand. However, authorities said they were not targeting one person, and it was not clear why the children were attacked.

Nakyta McCray, who lives nearby, said the man she believes police were looking for is well-known around the neighborhood. She said he plays with the local children and seemed to be a peaceful person.

"People would never think he would do something like this," she said.

Camden County prosecutors said Dominick was pronounced dead at the scene; they would not release further details on the attack, including what type of weapon was used.

Amber reportedly went door to door in the neighborhood to get help and finally reached the home of McCray, who called 911. McCray said the girl "was barely breathing" and bleeding profusely when emergency personnel arrived.

The teenager had been babysitting the other three children because their mother, who recently underwent surgery, was still in the hospital. Authorities said Dominick's father lives out of state. It was not known if he also was the father of the other children.

Camden, across the Delaware River from Philadelphia, continually ranks as one of the nation's most dangerous. The double stabbing comes shortly after another child died a violent death in the city. On Aug. 22, a 33-year-old Camden woman allegedly decapitated her 2-year-old toddler and then fatally stabbed herself.

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The Associated Press contributed to this report.