Police said there is no evidence of foul play.

On Sunday, Strain's bank card was found on the embankment between Gay Street and the Cumberland River, near Riverfront Park, police said.

Authorities have been searching by foot, by drone and by boat, including using boats with sonar equipment, according to police.

The United Cajun Navy has also arrived in Nashville to help and is organizing volunteers. David Flagg of the United Cajun Navy said they're searching the river and are putting together a \"structured and organized ground search.\"

Our helicopters continue to fly over the Cumberland River in the ongoing search for Riley Strain. MNPD & @NashvilleEOC boats were on the water again today. The Cheatham Co. Sheriff's Office is also assisting down river. See him? Pls call 615-862-8600. pic.twitter.com/qF96AQqzAO

— Metro Nashville PD (@MNPDNashville) March 20, 2024

And the search is now stretching beyond Nashville, with authorities on Wednesday shutting down a dam to look through debris about 30 miles downstream from the riverbanks where Strain was last seen, according to Nashville ABC affiliate WKRN.

\"We feel very confident with everything that's moving forward,\" Whiteid said of the police investigation, city support and volunteer searches. \"There's not a playbook we can go by when, you know, something like this happens, so the more experienced people you can have in your corner, the better.\"

Whiteid said that he believes \"somebody's seen something, somebody knows something.\"

\"They just have to realize they need to share that information with us,\" he said.

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