Investigators in Kansas City climbed through a window that parents said had been tampered with the night their 10-month-old daughter disappeared in an apparent attempt to re-enact an abduction.
Lisa Irwin's parents reported her missing early Tuesday after her father returned home from work. Her parents said someone must have crept into their home while the child's mother and brothers slept and snatched the baby girl.
The parents said the front window had been tampered with.
Investigators crawled through the window Sunday, and an officer was at the house early Monday for about 10 minutes, walking around to the back.
He did not speak to the media, and police haven't commented on any aspect of the investigation.
But police spokesman Capt. Steve Young says investigators are trying everything they can.
Investigators have said they have no solid leads or suspects despite an extensive search that has included hundreds of officers scouring the family's quiet Kansas City neighborhood, nearby woods and a landfill.
The baby's parents, Jeremy Irwin and Deborah Bradley, announced Saturday they were organizing a reward, hoping it would lead to new information, and that they'd be doing less media interviews.
Bradley has said she checked on her daughter around 10:30 p.m. Monday. Irwin, an electrician, said he discovered the child missing around 4 a.m. Tuesday when he got home from working a late-night shift, prompting a frantic search of their home.
But all they discovered was that many of the home's lights were on, a window was open and the front door was unlocked. The couple later said three cellphones also were missing, which police said produced no solid leads.
The Associated Press contributed to this report