Report: Police find possible new lead in the search for missing Kansas City baby Lisa Irwin

(CBS/AP) KANSAS CITY, Mo. - Authorities investigating the disappearance of baby Lisa Irwin say that a backpack reportedly containing used diapers was found in the area of a vacant house near the baby's family home, according to a report.

Pictures: Missing Kansas City infant

Kansas City police say that a man found the backpack on Saturday. Diapers were also found in a wooded area across the street from the house, reports local station WDAF.

However, on Saturday police spokesman Capt. Steve Young said that the diapers had been there for some time. He also said that it's not unusual to find objects like backpacks and diapers in abandoned houses.

Young said the crime scene unit will investigate further.

Military police from the Missouri National Guard joined the search Sunday crawling through a wooded area to make sure no evidence was overlooked in the search.

Lisa was 10 months old when her parents reported her missing Oct. 4. Her parents, Deborah Bradley and Jeremy Irwin, said she disappeared from her crib sometime overnight. Previous searches have included the family's neighborhood, nearby wooded areas, a landfill and abandoned homes.

On Friday, a $100,000 reward was offered by an anonymous donor for the child's safe return or information leading to a conviction of anyone involved in her disappearance.

Anybody with information in her disappearance is asked to call the TIPS Hotline at (816) 474-TIPS.

Complete coverage of Lisa Irwin on Crimesider