UPDATE – Authorities are now unsure of what caused a boat to crash in the Great Pee Dee River on Tuesday.

Four people were injured in the crash; emergency crews first believed the boat had struck the Yauhannah Bridge, which is located along US Highway 701 near the Horry County line.

Officials with the South Carolina Department of Natural Resources said on Wednesday the boat traveling in the river struck something in the water, but it did not hit the bridge.

“What the boat struck and the circumstances of that crash are under investigation,” SC DNR said.

Four people were injured and taken to the hospital — one airlifted — with injuries from minor to serious, but none are believed to be life-threatening.

GEORGETOWN COUNTY, S.C. (WCBD) – Emergency crews are responding to a Tuesday afternoon boat accident near the Yauhannah Bridge on the Great Pee Dee River.

The Georgetown County Sheriff’s Office confirmed reports that a boat struck the bridge, which is located along US Highway 701, not far from Murrells Inlet and the Horry County line.

Four people were on the boat at the time. All were reportedly injured in the crash; however, details about the incident are limited.

The Georgetown County Sheriff’s Office is responding along with other agencies.

People in the area are urged to use caution.

This is a developing story. Count on us for updates.