Lincolnshire Assistant Chief Constable Roger Bannister says he took part in raids on suspected internet paedophiles yesterday.
"It's actually relatively straightforward to indentify men who, through an internet connection - often a laptop or another kind of computer at home, access these kinds of indecent images of children," he says.
"We identify them...and then we arrest the individual."
More top news
An 'unarmed' black man, who was reported to be mentally ill, has been shot dead by police in California after his sister called for help.
"Rubble fell in on intensive care patients" in the early hours of Wednesday, medics said.
The inquiry's most senior lawyer is said to be considering stepping down after disagreeing with its chairwoman Alexis Jay over its future.