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Opportunistic thieves have tried to steal a cash machine from the High Street in Chatteris.
Cambridgeshire Police have told Heart they were called at 4:10am to reports of an attempted robbery at the Post Office.
The offenders had left the scene by this point, and got away empty-handed.
The High Street's been closed while police investigate.
A cordon's been set up in both directions between New Road and King Edward Road.
Officers are asking anyone who may have seen anything suspicious in the area at that time to give them a call on 101.