Amtrak train 91 — traveling from New York to Miami — derailed in Cayce, outside the state capital Columbia, after colliding with a CSX freight train at around 2:30 am (0730 GMT).
It was the third deadly incident involving an Amtrak train since December, raising questions about the safety of the national railway service.
Amtrak said in a statement that the lead engine derailed along with some passenger cars. Eight crew members and 139 passengers were on board.
A total of 116 people were taken to area hospitals for treatment, many with minor injuries, Governor Henry McMaster told reporters. US media reported injuries ranged from cuts and bruises to broken bones.
McMaster identified the dead as Amtrak personnel and said the freight train, which was stationary, appeared to have been empty.
“It appears the Amtrak train was on the wrong track,” the governor said, while cautioning that a full investigation was needed to determine the exact cause.
“We need a conversation around the country” about rail safety, he added, after visiting passengers at a shelter set up in a school by the local Red Cross.
“As you and your loved ones gather at church and other houses of worship today, we ask that you pray for those affected and the families of those who have passed away,” he said on Twitter.
– ‘Nobody was panicking’ –
US President Donald Trump, who was in Florida for the weekend, was briefed and was receiving updates, a White House spokeswoman said.
The president tweeted that his “thoughts and prayers are with all of the victims involved in this mornings train collision in South Carolina.”
The National Transportation Safety Board (NTSB) said it was investigating the incident. CSX said its personnel were on site to assist law enforcement.
The Lexington County Sheriff’s Department confirmed all passengers had been evacuated.
Officials added that although 5,000 gallons of fuel spilled following the crash, the leak was contained and there was no danger to the public.
“The incident is very near the state farmers’ market and other residential areas, but right now everyone is safe,” said Derrec Becker, public information officer at the South Carolina Emergency Management Division.
Passenger Derek Pettaway told CNN he was traveling south from Philadelphia to Orlando in a sleeper cabin when he was jarred awake by the impact of the crash.
“Nobody was panicking,” he said. “I’m pretty sure everybody was asleep and I think people were in shock.”
Pettaway said Amtrak staff evacuated passengers in a “really calm fashion.”
– Questions over safety –
The Lexington County sheriff later said four buses had been made available to take Amtrak passengers to their final destinations.
“My prayers are with the families of those killed in the train crash in Lexington County this morning, and hoping for the best for all those injured. South Carolina is with you all!” tweeted Tim Scott, one of the state’s two US senators.
Congressman Joe Wilson called the incident “heartbreaking.”
It came just days after an Amtrak train carrying several dozen Republican lawmakers including House Speaker Paul Ryan hit a garbage truck in Virginia, killing one person and causing six others, including a congressman, to require hospital treatment.
In December, three people were killed when an Amtrak passenger train derailed in Washington state near the city of Tacoma, sending cars flying off a bridge and onto a busy interstate highway.
Preliminary information from an event data recorder in the rear locomotive showed that train, in its maiden trip on a new route, was speeding at 80 miles (128 kilometers) per hour in a 30 mph zone.
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