Waterville, Maine (NEWS CENTER) - Former FBI profiler Clint Van Zandt has worked on cases involving missing children, similar to the Ayla Reynolds case.

He says an investigation like this is a methodical one that starts by focusing on the parents, turns to other people inside the house, then moves outside the home.

"Who had access to the house, who knew the little girl was there, what predators live, reside, pass through the area. This is going to be a multi-pronged investigation", he said from his office in Virginia.

Van Zandt says unfortunately child abductions are not that unusual. He says they happen on average of 1 every 3-days in this country. In almost all of those cases the children are taken from outside of their homes.

"For an offender to come into a home in the middle of the night, find that child's room and snatch that child away without anyone becoming aware, those are extremely rare cases", he said.

Tuesday investigators announced there are no new developments in the case. Police say they have followed up on about 400 leads, but so far there's been no trace of the little girl.

NEWS CENTER