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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The bridge is a substantial structure, set in one of the most sensitive and open locations in central London.
The leaflets handed by police have been branded 'stupidly obvious' by some.