As tens of thousands of tributes poured in from across the nation for the PC Fiona Bone and PC Nicola Hughes, more than one Facebook page was set up in praise of the suspect held by police.
One was titled Dale Cregan OBE, with internet "trolls" posting messages claiming the suspected killer was a "hero".
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America says it has "identified preparations" for an attack similar to that which killed at least 86, including 30 children, in April.
Despite the rain it will still feel muggy with highs of 22C.
The practice of sending mental health patients far away from friends and family for care has become endemic in the NHS, it has been warned.