All lines have now reopened and trains can run on their normal routes after disruption on First Great Western due to a signalling problem between Didcot Parkway and Swindon.
There are still delays of around 30 minutes to services and buses remain in operation. First Great Western expect normal service to resume from around 1pm.
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Three men have been arrested on suspicion of firearms offences following a National Crime Agency operation in Hailsham, East Sussex.
Both men were fatally injured in the smash, which happened at around midday.