A boy of 16 was stabbed to death at a railway station this evening (Wednesday 10 September), the British Transport Police (BTP) said.
Another 16-year-old boy was arrested on suspicion of murder and remains in police custody.
Southern Rail said that there would be trains to or from the station this evening and earlier the A259 coast road was also closed, with traffic tailbacks as a result.
The BTP said: “Detectives at British Transport Police (BTP) have launched a murder investigation after a boy sadly died at Seaford railway station this evening.
“Officers were called to the station at around 5pm this evening (Wednesday 10 September) following reports of a stabbing.
“Officers attended alongside colleagues from Sussex Police and paramedics and a young man was found with a serious injury, consistent with being stabbed.
“Despite the best efforts of paramedics, the 16-year-old boy was sadly pronounced dead at the scene.
“His next of kin have been informed.
“A 16-year-old boy has been arrested on suspicion of murder and remains in custody at this time.
“Inquiries are ongoing at pace to establish the full circumstances of the incident.”
Detective Chief Inspector Paul Stanley said: “This is a shocking incident which has resulted in the tragic loss of a young man this evening.
“The investigation remains in the early stages and the station will remain closed while we continue our inquiries in the area.
“I would urge anyone who may have witnessed what happened, or the lead up to it, to get in touch as you may have vital information which could help our investigation.
“Please contact BTP by texting 61016 or calling 0800 405040, quoting reference 428 of 10 September.
“Alternatively, you can call Crimestoppers anonymously on 0800 555111.”