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Fracking has resumed again in Lancashire after a minor earthquake on Tuesday led to an 18 hour suspension.
Energy firm Cuadrilla halted the work at the Preston New Road site in line with regulations. But they say the micro-seismic event measuring 1.1 magnitude was below anything that would cause damage or harm.
Two smaller tremors affected the site last week.
Anti-fracking campaigners argue the process, to extract shale gas, poses risks to the environment.
According to the BGS, earthquakes with magnitude of less than two are not usually felt and, if they are, it is only by people very close to the earthquake.
Fracking has once again been halted at Cuadrilla's site in Lancashire after yet another earthquake was recorded in Blackpool this morning.
Its the thirteenth tremor since fracking began last Monday and the biggest so far.
Its been classed as a ''red event' and the energy company has paused operations for at least the next 18 hours as monitoring continues.
Adam McClean reports from the Preston New Road site.
Energy firm Cuadrilla say they've stopped fracking in Lancashire for the moment after an earth tremor.
What's been described as a 'seismic event' happened at the Preston New Road site this afternoon.
Anti fracking campaigners say the tremor is a "worrying sign"
Rob Jaskowski reports:
Fracking firm Cuadrilla say they've stopped fracking for the day after a 'seismic event' occurred at the Preston New Road site
The company say the tremor was 0.4 magnitude and described it as extremely low. They say they've adopted extra precautions by stopping work until tomorrow.
A spokeswoman for Frack Free Lancashire said the tremor was a "worrying sign".
More than a thousand people have taken part in a protest march against fracking in Lancashire.
It comes after minor earthquakes were reported near the site at Preston New Road on Friday.
Cuadrilla say they were not fracking at the time the tremors were felt.
Adam McClean reports.
Three anti-fracking activists have been greeted by supporters as they left prison after six weeks.
Simon Blevins, Richard Roberts and Rich Loizou were jailed at Preston Crown Court in September after being found guilty of public nuisance over a protest last July at Cuadrilla's fracking site in Lancashire.
But they were freed on Wednesday by Court of Appeal judges, who said their original sentences were "manifestly excessive".
They were greeted by more than 30 supporters, as well as a number of camera crews and journalists, as they left HMP Preston shortly after 4pm.
Latest ITV News reports
MPs have called a debate in Westminster over concerns to fast track more fracking site and bypassing local democracy.
Fracking in Lancashire has been brought to a halt again after another earth tremor - the second measuring 0.8 in two days