Two passengers who suffered "severe" injuries when a Southern Rail train derailed in East Sussex do not have life-threatening conditions, police have said.
A major incident wasassenger declared by British Transport Police (BTP) on Thursday afternoon after three carriages turned on their side near Lewes, trapping passengers on board.
Around 150 people were on board the service travelling from London Victoria to Eastbourne when the train was evacuated.
Two people were taken to major trauma centres for medical treatment following the incident.
BTP confirmed on Friday that the injuries sustained are not considered to be life-threatening.
A statement said: “They both remain in hospital and the 18 people who were also treated at hospital for less serious injuries have been discharged.”
Assistant Chief Constable Ian Drummond-Smith added: “Our thoughts remain firmly with those who were injured and their loved ones. On behalf of BTP, I wish them a full and speedy recovery.”
The force is appealing for anyone on board the derailed train who have not already spoken to police to come forward.
Officers said many passengers left the area and took alternative routes home after they were evacuated.
Pictures show rail staff, police and members of the Rail Accident Investigations Bureau (RAIB) beside the tracks on Friday.
Mr Drummond-Smith said the public can expect to see a “continued police presence” at the scene in the coming days as the RAIB’s investigation into the cause continues.
The senior officer also paid tribute to communities and emergency services who responded to the derailment.
“Local Lewes residents and business owners came out in their droves to support affected passengers, providing water and refreshments in extremely hot conditions,” he said.
“My thanks and appreciation go to them, as well as our officers and emergency service colleagues whose professionalism ensured those on board were brought to safety in incredibly challenging circumstances.”
John Whitehurst, chief executive of Greater Thameslink Railway, said on Friday derailments are “incredibly rare”, adding that what happened near Lewes “was a very serious incident and I’m deeply saddened by it”.
Asked on the BBC Radio 4’s Today Programme if the railway was safe in hot weather, Mr Whitehurst said: “The railway is safe. These types of incidents are incredibly rare.
“We have control processes in place that involve inspection, temporary speed restrictions or even suspending services if that’s required.”
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