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
The squalid conditions in Calais shanty towns, nicknamed 'The Jungle', where migrants stay who are desperate to get to the UK.
An emergency call handler who hung up on a frantic caller as she tried to save her dying friend's life has resigned.
Suspected plane debris which has washed up off the east coast of Africa may be tested to see if it has any link to the downed MH370 plane.