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."
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The mother of one of the Manchester attack victims has told of the distressing moment she found her daughter being treated after the attack.
Marjorie and Michael Cawdery, both 83, are understood to have been stabbed to death in a killing their family called "incomprehensible".
Detectives have launched a murder investigation following the shooting in Brent, north west London on Friday night.