Chicago Police Superintendent Garry McCarthy said officers "have very good leads" in their search for the person responsible for killing Shamiya Adams, who was struck by a random bullet at a sleepover Friday night at a friend's house in Chicago's Garfield Park neighborhood.
"We have a lot of information and the case is developing quickly," McCarthy told the station. He also said detectives were stunned that a bullet fired from outside the home went through a window that was open no more than two inches and hit Adams in the head.
According to CBS Chicago, a street memorial for the 11-year-old continues to gather cards, posters, candles and balloons.
Aaron Hill, the father of the girl who hosted Friday night's slumber party, expressed frustration.
"Our kids can't be safe in their own home, doing what little girls do," he told the station.
Mayor Rahm Emanuel, who phoned Shamiya's mother after the incident, said he did not want her to blame herself for sending her daughter to the party.
"I tried to do this as a parent, not as mayor alone," Emanuel said. "You never want an individual to feel alone, or they made the wrong choice."
Hill told CBS Chicago that Garfield Park residents have lost a sense of security in their own neighborhood.
"This was supposed to be our safe haven, but it wasn't," he said.
A reward for $8,000 has been offered to anyone who can provide information that leads to an arrest.
Shamiya's father told the station funeral arrangements for his daughter are still being planned.