03:01PM, Tuesday 23 August 2016
Update 5.53pm: Network Rail has tweeted to say the problems have now been fixed and trains are now able to run normally.
Rail passengers are facing delays of up to 30 minutes after signalling problems at both Slough and Maidenhead.
National Rail said disruption is expected to continue until about 6pm.
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Police raided addresses in Lillibrooke Crescent, Cox Green, and in Crown Lane, Farnham Royal, at about 7.15am.