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.