There are delays on rail services to London after a two people were killed when they were hit by a train in Slough.
British Transport Police has said it is treating the incident as suspicious.
Network Rail said there was delays of up to an hour between Oxford and London Paddington.
The mainline through Slough is closed, as is the station, but relief lines have opened allowing trains to run.
It is believed the delays will last until at least 12.45pm.
A spokeswoman from First Great Western said: “We have had reports of someone hit by a train in Slough.
"Emergency services now have access to the rails so all services through Slough will be put on hold for at least the next 90 minutes.
“Passengers travelling from Oxford can use Chiltern Railway services to Marylebone.”
A British Transport Police (BTP) spokesman said: “Our officers were called to Slough railway station shortly before 9.45am on Tuesday, September 23 following reports that two people had been struck by a train.
“Thames Valley Police and South Central Ambulance Service also attended the incident, and two people were pronounced dead at the scene.
“The incident is currently being treated as suspicious. Officers are working to identify the deceased, and a full investigation has been launched.
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