Disruption on South West Trains between London Waterloo and Alton, and between Guildford and Ascot due to earlier lineside fire at Aldershot.
Some trains are running via Aldershot but cancellations and delays of up to 40 minutes are possible until around midday.
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Two women have died in a crash involving a car and police vehicle in Calcot. It happened on the A4 Bath Road just before 4pm on Tuesday.
Trains are expected to be disrupted into this afternoon.
The attack is said to have happened in Basingstoke on Monday.