Assistant Chief Constable Garry Shewan, of Greater Manchester Police, has spoken about "tasteless" comments made online following the deaths of PCs Fiona Bone and Nicola Hughes.
Speaking at a news conference, he said:
Anybody who perhaps wishes to take the opportunity following such a tragedy to tastelessly add derogatory comments and perhaps think that they are poking fun at such at such a tragic situation will always cause a great degree of emotion.
Not just in police officers but ordinary members of the public.
I looked at some of these websites and saw ordinary members of the public alarmed and really distressed at some of the ridiculous comments put on there.
And I think they would have wanted us to be able to take positive action and that's exactly what ourselves and Merseyside Police have done.
More top news
Google has been forced to apologise after a black couple were labelled as "gorillas" by the company's new photo app.
However, today the UK may very well be taking the first step down that road, says Carl Dinnen.
Alton Towers has apologised after it took up to an hour to evacuate passengers from a broken down monorail on the hottest day of the year.