UPDATED 05/09/11 10:00 p.m.

CHICAGO (CBS) — It happens every spring, when the weather gets warmer and open windows allow criminals of all types access to what they seek.

READ MORE: Proposed Federal Legislation Would Impose Regulations To Prevent Black-Market Brokering Of Donated Body Parts

In a horrific case in the South Shore neighborhood over the weekend, the victim of such an incident was a 9-year-old girl, who was sexually assaulted as she slept.

The incident occurred overnight in the 2500 block of East 72nd Street and was reported, according to police News Affairs Officer Darryl Baety.

The girl was apparently left at home alone while her mother was at work when the suspect came in through the window, said Baety.

“He sexually assaulted her and then when she woke, he fled the scene,’’ said Baety.

Baety said the child was taken to an unidentified hospital.

READ MORE: Woodridge Residents Cope With Emotional Impact Of Damage From Sunday Night Tornado; Village Places Priority On Getting Power Back On

Police only have a vague description of the suspect. He is described as white or Hispanic, slim, and about 6 feet tall.

In the building where the attack occurred, residents are worried about the child victim, they fear whoever hurt her might return.

Resident Antoinette Jordan someone tried to break in last week. Some windows that line the back porch stairs have bars on them, but some don’t.

There is a locked gate leading to the back porch area. There are also plenty of cameras.

“With all the cameras around this neighborhood we’re hoping that some surveillance might have caught this perpetrator,” says community activist Andrew Holmes, who was going door to door Monday to warn residents.

MORE NEWS: Residents Repairing Homes After Tornado Run Into Sky-High Prices For Lumber, Other Construction Materials

The Sun-Times Media Wire contributed to this report.