Six teens drowned after they waded into unfamiliar waters and fell into a deeper part of the Red River in Shreveport, Louisiana, officials said.
One additional member of the group was rescued, Shreveport Assistant Fire Chief Fred Sanders told CNN.
He said no one in the group of teens, who ranged in age from 13 to 18, could swim.
The victims were part of two families, and three of the victims were brothers, he said.
Divers on scene said the river bed drops from a shallow area to 20 feet, Sanders said.
People nearby heard the teens screaming for help, CNN affiliate KSLA reported.
Local ministers were in the area counseling grief-stricken family members Monday evening, KSLA said.
"Please lift this family up in prayer," Shreveport Mayor Cedric Glover told KSLA.