Image caption Slough station has reopened and all lines through it are back in service

A mother and her 10-year-old son were killed when they were hit by a train in Slough, Berkshire.

British Transport Police said the deaths were being treated as suspicious, but no third party was being sought.

They said the possibility of a murder-suicide was "one of the lines of inquiry" officers would be pursuing.

A South Central Ambulance crew pronounced the two dead after being called to the scene at 09:45 BST.

Image copyright Steve parsons/ PA Image caption The station was cordoned off for nearly six hours while police gathered evidence

During a lunchtime news conference outside Slough station, Ch Insp Jenny Gilmer said: "The incident is currently being treated as suspicious.

Image copyright PA

"Our detectives have launched a full investigation but they do not believe there was any third party involvement at the station."

'Lines reopened'

Emergency services and forensics officers blocked off two of the four lines in and out of London Paddington at Slough for six hours, causing severe train delays and cancellations.

All lines were later reopened.

A First Great Western spokeswoman said at 18:00 BST that a normal service was now running.

Image copyright Steve parsons/ PA Image caption Ch Insp Jenny Gilmer from British Transport Police said a murder-suicide was "one of the lines of inquiry"

Image copyright Steve Parsons/PA Image caption Two of the four lines at Slough were shut earlier as forensics officers worked on the track

The train that hit the mother and son, the 08:41 from Bedwyn, was able to resume its non-stop service to Paddington just after 13:00.

Dan Paynes, a spokesman for First Great Western, said the driver of the train was replaced at Slough.

"He is receiving all the support he needs and probably won't drive again for some time," he said.

Passengers had earlier been kept on the train while investigations were carried out.