A reward of £25,000 has been offered for information leading to the arrest of two suspects over the death of a man who died in a gun and grenade attack at his home.
The body of David Short, 46, was found at his house in Clayton, Manchester, on August 10 after police responded to reports of gunfire.
Less than 10 minutes after Mr Short's body was discovered in Folkestone Road East, Greater Manchester Police received reports that shots had been fired at a second property, in Luke Road, Droylsden, where detectives say there was also a grenade blast. No one was injured in the second incident.
His son, amateur boxer Mark Short, 23, was killed in May when he was shot in the neck at the Cotton Tree pub in Droylsden when a gunman walked in and opened fire. Three other men were shot during the attack and suffered leg and back injuries.
Dale Cregan, 29, from Droylsden, and Anthony Wilkinson, 33, from Beswick, are both wanted in connection with the two attacks last Friday. Cregan is also wanted over the murder of Mark Short.
The reward is being offered for anyone who is able to give information anonymously to the independent charity Crimestoppers which leads to the arrest of Cregan and Wilkinson.
Assistant Chief Constable Steve Heywood said: "Over the past week we have been carrying out a thorough and significant police investigation into the circumstances surrounding the murder of David Short. While we have been pursuing a number of lines of inquiry, we believe that there are people out there who have information that can help us trace Cregan and Wilkinson but are not helping us, for whatever reason.
"I want to reassure these people that they can call Crimestoppers anonymously on 0800 555 111 and I hope that the offer of a reward gives them an added incentive.
"A reward of this nature is rare for two reasons. Firstly, it is available only to those who call Crimestoppers. And it is a major development for a reward to be offered in relation to an arrest only. Crimestoppers will not pass your name to us, so we will never know it is you who has called us."
The North West regional manager for Crimestoppers, Gary Murray, said: "The two individuals being sought are considered to be dangerous by police and I would urge anyone with information on their whereabouts to contact Crimestoppers anonymously and not approach them."