The first shooting in the popular South Carolina tourist town of Myrtle Beach left 11 people wounded, and police fatally shot one person, authorities said.
Myrtle Beach officers responded to a disturbance involving multiple individuals on Saturday night in which someone began firing a weapon.
In a statement, the department said "based on the immediate threat" an officer then shot one person, who died from their injuries.
Myrtle Beach Mayor Brenda Bethune told WBTW-TV the officer responded appropriately. The Horry County deputy coroner identified the person shot as 18-year-old Jerrius Davis, according to WBTW.
"Our officer saw what happened, and when he saw that an altercation was taking place and a gun was being shot, the officer responded very quickly and in my opinion, saved lives," Horry County Deputy Coroner Tamara Willard said.
"Last night could have been so much worse."
The department said 11 people who sustained injuries were receiving medical treatment.
Meanwhile, another shooting at a small college in eastern North Carolina left one person dead and six others wounded, and prompted a campus lockdown.
The shooting occurred on Sunday in the centre of Elizabeth City State University's campus following Yard Fest, the final event of the historically Black university's week-long Viking Fest celebration, the school said in a statement.
A 24-year-old man who was not a student was pronounced dead. His identity wasn't immediately released pending notification of his family, the statement says.
Four people sustained gunshot wounds, including three students, while two other students were injured during the commotion. None of the injuries were considered life-threatening. All the injured were taken to hospital for treatment, the statement said.
A call to campus police was referred to a university spokesperson, who didn't immediately return a telephone message.
"The university is deeply saddened by this senseless act," the university said in an earlier statement.
The lockdown was later lifted, and the university increased patrols across campus as a precaution. Access to the centre of campus remained restricted later Sunday.
The university has 2300 students and is about 80km south of Norfolk, Virginia.
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