CHICAGO (CBS) — Police say the investigation into the shooting death of 11-year-old Shamiya Adams is progressing rapidly.

“We have very good leads,” said Chicago Police Superintendent Garry McCarthy. “We have a lot of information and the case is developing quickly.”

Adams was killed after being struck by a random bullet at a sleepover Friday night in Garfield Park. McCarthy said detectives were amazed that a bullet fired on the street went through a window open no more than two inches or so to claim her life.

CBS 2’s Derrick Blakley reports the street memorial to her life is growing by the hour with cards, posters, candles and balloons mounted by young and old for Shamiya Adams.

One side of Alice Herron’s poster reads: “Why are we killing each other, let our children live,” and the flip side reads: “Please let our children grow up!”

“Guns are the issue, retaliation, all of this is not the answer,” said Herron.

Aaron Hill is the father of the girl who hosted the slumber party where Shamiya Adams died.

“Our kids can’t be safe in their own home, doing what little girls do,” said Hill.

Mayor Emanuel, who phoned Shamiya’s mom, didn’t what her to blame herself for sending her daughter to the sleepover.

“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.”

In Garfield Park, they’re haven’t only lost Shamiya, they’ve lost of any real sense of security.

“This was supposed to be our safe haven, but it wasn’t,” said Hill.

An $8,000 reward is being offered for information that leads to an arrest. Shamiya’s father tells Blakley that funeral arrangements are still being planned.