A man is under arrest after a Facebook page was set up lauding suspected police officer double killer Dale Cregan as a "legend".
The "tribute" went online within hours of PCs Nicola Hughes, 23, and Fiona Bone, 32, dying in a gun and grenade attack in Hattersley, Tameside, on Tuesday morning.
Greater Manchester Police announced the arrest as officers continued to question Cregan, 29, on suspicion of murder.
He was detained after walking into a nearby police station after the attack.
More top news
Details of thousands of peoples' medical records are being sold to fraudsters, it has been reported.
Britain is engaged in a "technology arms race" with terrorists determined to cause the country harm, the head of MI6 has warned.
The clock is ticking on Iran's nuclear development talks at a meeting with six world powers including Britain in Switzerland.