KANSAS CITY, Kan. – The family of a missing Missouri baby reached out to tens of thousands of NASCAR fans Sunday, hoping to spur efforts to locate the child as investigators sifted through hundreds of tips that so far have led them to dead ends.

Ten-month-old Lisa Irwin hasn’t been seen in nearly a week. Her parents reported her missing early Tuesday, saying she was snatched sometime overnight from their home in Kansas City, Mo.

Her aunt, Ashley Irwin, handed out thousands of fliers in a parking lot at Kansas Speedway during Sunday’s NASCAR Sprint Cup race. She has been trying to raise awareness about her niece’s disappearance, from prayer vigils to online social media, and said targeting the 80,000 fans attending the race would help.

Investigators have said they have no solid leads or suspects in the case despite an extensive search of the family’s quiet neighborhood, including their home and neighbors’ houses, along with nearby woods, sewers and a Kansas landfill.

Lisa’s parents, Jeremy Irwin and Deborah Bradley, spoke with detectives late Saturday, police spokesman Capt. Steve Young said Sunday.