Detectives are hunting a gang suspected of stealing £3,000 and causing £100,000 of damage by slicing through railway ticket machines with an angle grinder and pickaxes. Six machines across north London and Hertfordshire have been targeted since April.
Police are searching for three suspects seen on CCTV footage.
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Scotland Yard confirm that two people arrested in connection with the attack on Westminster have been released with no further action
An appeal to support the family of murdered policeman Keith Palmer has reached more than £700,000 in two days.
PC Keith Palmer will be remembered permanently at the National Memorial Arboretum, Home Secretary Amber Rudd has said.