A passenger train has derailed in East Sussex, prompting a rapid emergency response in the area.

Images of the aftermath show at least two carriages on their side. They appeared to show passengers standing on top the toppled carriages while others could be seen in area of heathland alongside emergency workers.

Several rail routes were closed after the Southern service came off the tracks near Lewes just before 4pm.

Emergency services said people should avoid the area, and that anyone travelling by rail in the area should allow up to 60 minutes extra for their journey.

A spokesperson for Network Rail and Southern Rail said: “We are aware that a passenger train has derailed in the Lewes area of East Sussex. Emergency services are on site and we will update with more information when we can.”

A statement from British Transport Police said: “We’re responding alongside paramedics and the fire service and will provide more information as soon as we can.”

Heidi Alexander, the transport secretary, tweeted: “Deeply concerned of reports of a derailment involving a Southern train in Lewes, Sussex.

“Grateful to emergency services who are on the scene supporting those impacted. We are working quickly with the rail industry and local partners to assist passengers.”

More details soon …