The controversial fracking process involves fluid being forced down a hole in the ground, fracturing the rock and releasing gas.
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Campaigners hit out at a north Wales council after councillors backed plans to be the first in Wales with four-weekly bin collections.
A major crime review team raised concerns around the initial investigation, and the document was "a trigger" for the Surrey Police probe.
Five incidents, involving a man and a vehicle, have all taken place since January 26.