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
Mostly dry across the north of the UK today, with spells of sunshine and isolated heavy showers for some.
Huntingdon's, autism and congenital heart conditions are among those likely to be exempt from reassessment.
A woman and man have been charged with murder after a baby was found unresponsive on a bus.