Six people are in hospital as police deal with an active shooter on a university campus in Florida.
Of the injured, one is said to be in a critical condition, according to a local hospital.
Officials have one person in custody in connection with the shooting, a spokesperson for the Tallahassee Police Department confirmed to Sky News's US partner NBC News.
The extent of the victims' injuries was not immediately known and there were no additional details about the person who was in custody.
Videos showed people running through traffic, fleeing the scene, around the time of the shooting at the student union at Florida State University's campus in Tallahassee.
Local police were "on the scene or on the way", according to an alert sent out by the school and students have been told to "shelter in place".
The FBI is also said to be responding to the incident.
In a statement, Tallahassee Memorial HealthCare said it was "actively receiving and caring for patients" from the incident.
"At this time, details are still unfolding, and we do not yet have specific information to share. However, we want to assure the community that our teams are fully mobilised and prepared to provide the highest level of care and support to all those affected," it added.
President Donald Trump said he was fully briefed on the incident and described it as "a shame".
He added: "It's a horrible thing. Horrible that things like this take place."
Florida governor Ron DeSantis, in a statement posted on X, said: "Our prayers are with our FSU family and state law enforcement is actively responding."
Ambulances, fire trucks and police vehicles raced to the campus around midday local time (5pm UK time) on Thursday.
As students streamed away from the area of the student union in their hundreds, some were visibly emotional and others were glued to their phones.
Dozens later gathered near the university's music school, waiting for news.
Florida State University student Daniella Streety told NBC News of the chaos that unfolded at the scene.
She remained on lockdown in a campus building and said: "I did see them carry out one student in what looked like on a stretcher and kept them in the road until an ambulance was able to pick them up."
Joshua Sirmans, 20, was in the university's main library when he said alarms began going off warning of an active shooter.
Police escorted him and other students out of the library with their hands over their heads, he said.
This breaking news story is being updated and more details will be published shortly.
Please refresh the page for the fullest version.
You can receive breaking news alerts on a smartphone or tablet via the Sky News app. You can also follow us on WhatsApp and subscribe to our YouTube channel to keep up with the latest news.
Comments