Parents wait for news after a shooting at Marjory Stoneman Douglas High School in Parkland, Florida on Wednesday [Joel Auerbach/AP]
At least 17 people have been killed in Florida after a gunman opened fire on a local high school, in one of the deadliest mass shootings in US modern history.
Authorities warned late on Wednesday that the death toll could rise as some of the more than 14 people who were wounded were in critical condition and undergoing surgery.
Police say the suspect is 19-year-old Nikolas Cruz who was expelled from high school for disciplinary problems. He was taken into custody shortly after the shooting.
Officials said the gunman began shooting outside the Marjory Stoneman Douglas High School in Parkland, Florida at about 2:40pm local time on Wednesday.
He then entered the school and continued the rampage, using a semiautomatic AR-15 rifle.
Those inside the school can be heard yelling “Oh my God!” as shots rang out in videos circulating on social media.
A student told local media he had to wait in a closet while the school was under a “code red” lockdown.
“I was just in disbelief. I was texting my friends and my family,” the student told WPTV-TV, an NBC affiliate in West Palm Beach, Florida, after being evacuated from the school.
“I didn’t believe it was actually happening,” he said.
The gunman then fled the scene and was taken into custody about an hour later in a neighbouring city, officials said.
“It is a horrific situation,” Broward County public school Superintendent Robert Runcie told The Associated Press. “It is a horrible day for us,” he added.
Sheriff Scott Israel called the shooting “catastrophic”, saying that “there really are no words”.
“My prayers and condolences to the families of the victims of the terrible Florida shooting,” US President Donald Trump said. “No child, teacher or anyone else should ever feel unsafe in an American school,” he added.
18 school shootings in 2018
Everytown for Gun Safety Support Fund, an organisation advocating for gun control, had recorded 17 school shootings this year alone prior to Wednesday shooting in Florida. Two were classified as attempted or completed suicides with no intent to harm others.
In January, a 15-year-old male student allegedly open fire at a high school in Benton, Kentucky, killing one person and injuring more than a dozen others.
Nearly 300 school shootings have been reported since 2013 across the United States, Everytown said.
Wednesday shooting is among the top 10 deadliest mass shootings in the US modern history.
It has again renewed the debate surrounding gun control in the US.
Last year, a gunman opened fire on a church in Texas, killing 26 people. About a month earlier, another gunman killed at least 58 people at a concert in Las Vegas, Nevada.