Two teenagers have died after they were hit by a train near Elstree and Borehamwood station in Hertfordshire in a suspected suicide pact.
The boy, 18, and girl, 14, were hit by a train travelling from St Albans to Sutton in Surrey.
It is believed that each of them was found with a suicide note. British Transport Police (BTP) confirmed they were not treating the deaths as suspicious.
The students, from Hertswood Academy in Borehamwood, who have yet to be formally identified, were pronounced dead at the scene.
Gary Sanderson, of the East of England Ambulance Service, said: "On arrival it was evident nothing could be done."
The school displayed a message on its website saying: "We were contacted by the British Transport Police to inform us of an incident that had occurred overnight involving two of our students.
"From the details that we have been given we believe that two of our students, one in year 10, and one in year 13, have tragically died.
"Students and staff have been informed and we are offering counselling to those affected by this tragedy. We will be closely monitoring the wellbeing of all students in the coming days and offering any necessary support.
"Our thoughts are obviously with the parents and families of those who have died and we would ask all to respect their privacy at this most difficult time."
No passengers were on the train at the time of the incident. Roger Perkins, a spokesman for First Capital Connect, said its staff were receiving support.
Perkins added: "This was a shocking incident and our hearts go out to those involved. We have been giving our full support to our employees who were at the scene and will do all we can to help the emergency services in their investigation."
The Samaritans provide support to people in distress. They can be contacted on 08457 90 90 90