According to the sheriff's office, one person swam to shore, two managed to make their way onto an island and the river and two females grabbed overhanging tree branches from the island.
A Natrona County Sheriff's Office spokesperson gave additional details on a Tuesday evening incident that prompted a heavy law enforcement response in south-central Casper.
The Natrona County Sheriff's Office, as well as the Casper Police Department and the Natrona County Special Response Team are onsite, assisting with the active investigation.
The Casper Police Department partnered with other local agencies, as well as the DEA, to perform cannabis trafficking stings during the last two days of March.
An affidavit of probable cause states police were called to a car dealership in Casper on March 4 for a report that a vehicle was stolen from their lot.