Hundreds of people were in the park Saturday, police said. Authorities are still looking to speak with people who were there, including a professional photographer taking pictures of a family and a jogger whom police have not been able to identify.

Authorities have also checked dozens of dumpsters, searched the park's lake using sonar and divers and scanned the area with helicopters and drones, police said.

\"PHOTO:
Gastonia Police Dept.
PHOTO: Drone photos from Gaston County Emergency Management Services in the search for Maddox Ritch, 6, at Rankin Lake Park in Gastonia, N.C.
>

We are searching all around the Rankin lake Park for 6-year-old Maddox Ritch. The @GPDNC SWAT team hand searched through dumpsters in the area. pic.twitter.com/ZCGuLJCBDz

— FBI Charlotte (@FBICharlotte) September 24, 2018

Help the #FBI & @GPDNC #FindMaddox Ritch who was last seen at Rankin Lake Park in Gastonia, NC, on September 22, 2018, wearing an orange t-shirt with writing \"I am the man\" & black shorts. Call the tip line at 704-869-1075 if you have any information to help. pic.twitter.com/MrbuPeSCZz

— FBI Charlotte (@FBICharlotte) September 25, 2018

Authorities have also recorded messages from Maddox's parents and are playing those messages in the woods in the hopes that their voices will persuade him to come out if he's there, FBI Special Agent Jason Kaplan said Monday.

Former FBI agent and ABC News contributor Brad Garrett said that the idea of broadcasting Maddox's parents' familiar voices makes perfect sense.

Children with special needs \"tend to be extremely close to their parents,\" Garrett told ABC News. \"If you have a kid that can't really communicate but his parents talk to him every day ... I completely understand why they would do it.\"

Garrett said the FBI likely recorded the phrases Maddox's parents use with him most often.

Anyone who was at Rankin Lake Park on Saturday is asked to call the tip line at 704-869-1075.

\"We have spoken to many people who were there, but we want to make sure we talk to them all,\" Gastonia Police Chief Robert Helton said in a statement released by police Monday. \"No piece of information is too small. Something you may think is insignificant could be helpful to our case.\"

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