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2 November 2011 Last updated at 14:42 ET
http://www.bbc.co.uk/news/uk-england-lancashire-15550458
It is "highly probable" that shale gas test drilling triggered earth tremors in Lancashire, a study has found.
But the report, commissioned by energy firm Cuadrilla, also said the quakes were due to an "unusual combination of geology at the well site".
It said conditions which caused the minor earthquakes were "unlikely to occur again".
Protesters opposed to fracking, a gas extraction method, said the report "did not inspire confidence".
Six protesters from campaign group Frack Off climbed a drilling rig at one of Cuadrilla's test drilling sites in Hesketh Bank, near Southport, ahead of the report.
They oppose the controversial extraction method which pumps water and chemicals underground at high pressure to shatter rock formations and release gas, claiming it can be unsafe.