US government geologists have reported that the number of earthquakes in the central United States rose "spectacularly" near where oil and gas drillers fracked.
The average number of earthquakes of magnitude 3 or greater in the US mid-continent - an area that includes Arkansas, Colorado, Oklahoma, New Mexico and Texas - increased to six times the 20th century average last year, scientists at the US Geological Survey said in an abstract of their research.
More top news
Anger at the verdict in the shooting of black teenager Michael Brown has left the US deeply divided during its celebration of togetherness.
For most of the country, tomorrow is set to get off to a more pleasant start as it should be drier and brighter with the odd sunny spell.
A man who was abused by John Allen as a child has spoken out as the former care home boss has been found guilty of a further eight charges.