Two 15-year-old students, one boy and one girl, have died following a shooting at a Kentucky high school.
Another 17 people, all believed to be students, were injured during the shooting on Tuesday morning at Marshall County High School, State Governor Matt Bevin said.
He added that 14 of those injured, including the deceased, had gunshot wounds with five remaining suffering from other injuries.
At a press conference, Governor Bevin showed visible emotion as he said: "Two have passed away, one was at the scene. That student was a 15-year-old female.
"A second student, also 15 years old, a male, passed away at the hospital."
Authorities believe all of those shot in the incident were students.
A male suspect, also a 15-year-old student, was apprehended at the scene by a Marshall County deputy in a "non-violent manner", authorities said.
He said the suspect will be charged with murder.
Kentucky State Police Commissioner Richard Sanders said the suspect was armed with a handgun.
Mr Sanders said: "There's a lot to be done. It's going to be a long few days and I ask for your patience. When we can release additional information we will, but we don't want to do anything to hamper the prosecution.
"I will tell you the 15-year-old is being going to be charged with murder and attempted murder and we're working with the authorities now to proceed with those charges."
Earlier, Governor Bevin released a statement on Twitter describing the incident as a "tremendous tragedy"
He added: "It is unbelievable that this would happen in a small, close-knit community like Marshall County.
"I encourage people to love on each other at this time."
Students ran for their lives out of Marshall County High School, jumping into cars and running down a highway, some not stopping until they reached a McDonald's restaurant more than a mile away.
"They was running and crying and screaming," said Mitchell Garland, who provided shelter to between 50 and 100 students inside his nearby business.
"They was just kids running down the highway. They were trying to get out of there."
Student Greg Rodgers, 17, told NBC News that when he arrived at school he saw students running out of the building.
"I pulled off to the side of the road because everyone was running to the main road," he said. "I asked my friend what was going on and he told me that there was a school shooting. I was shocked. He said that someone had just shot up the school."
He said gunfire broke out as the students were making their way to morning classes.
"I'm distraught from all of it. I couldn't really focus driving home. I was shaking a lot driving back to my house. I'm still shaking," he added.
Detective Jody Cash of the Kentucky State Police said the "situation is no longer active."
Ambulances and numerous police cars converged on the school and offficers in black fatigues carrying assault rifles attended the scene.
Victims were taken to two hospitals, some by helicopter, said Darlene Lynn of Marshall County Emergency Management.
Meanwhile, a soccer coach at the school said all of her players are safe.
Savana Smothers, the assistant girls' soccer coach for Marshall County High School, told The Associated Press: "You just never think this will happen in a small town like ours."
WPSD-TV reports the high school students are being bussed to a middle school where parents can pick up them up.
It was the country's first fatal school shooting of 2018.