(CNN) A 2-year-old girl is dead after part of a store display fell and hit her on the head in Orland Square Mall in Orland Park, Illinois, on Tuesday.

Police said Alexa Martinez was with her grandmother, aunt and four other children in an Akira store. Witnesses said the child was climbing on a temporary wall in the shoe department when it came down on top of her.

"It appears that two temporary steel walls, approximately 8 feet high and 3 feet wide, somehow fell over," said Orland Park Police Chief Tim McCarthy, according to CNN affiliate WGN-TV . The walls weighed between 75 and 100 pounds each, said McCarthy.

A doctor and a nurse rushed to help the child and performed CPR. The toddler had begun breathing and regained a pulse by the time first responders got there, but she died from her injuries after she was transported to Advocate Christ Medical Center in Oak Lawn, according to police. "People pulled the partitions off of the child and a doctor and nurse came over right after," McCarthy said in a news conference. "Everything that could have been done was done under the circumstances."

Several people called 911 to report the accident.

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