Researchers at Durham University have published a major report looking into the dangers of fracking.
They say the process, which involves fracturing rocks to release shale gas, is relatively safe.
But they warn that drilling boreholes, whether for fracking or for any other reason, is potentially dangerous.
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Police carrying out a drugs raid in Stockton found a cannabis farm with plants valued in excess of £60,000.
No one was understood to be injured in the incident and the reason for the engine failure is currently unknown.