Greater Manchester Police Assistant Chief Constable Garry Shewan has revealed details of an arrest made over an offensive Facebook page created after the deaths of PC Fiona Bone and PC Nicola Hughes.
Speaking at news conference, he said an investigation by Greater Manchester Police and Merseyside Police led to the arrest of a 22-year-old man from Merseyside last night.
He remains in custody and is being questioned.
More top news
A British paleontologist has discovered a new species of dinosaur while studying fossils in a Canadian museum.
Sebastian Michaelis, one of a small group of tasters employed by Tetley, can grade a variety of tea in just 15 seconds.
The number of obese diabetics undergoing drastic weight loss surgery needs to triple to tackle a "major problem" facing the NHS, Nice warns.