Whitley escaped from lawful custody on 19 July 2014 and we are making every effort to find him.
He is not to be approached by members of the public, but if anyone sees him or knows of his whereabouts, please contact GMP on 101 immediately.
I would also urge Whitley to hand himself in at his nearest police station and to remind people that if anyone is found to be assisting or harbouring Whitley, they too will face being arrested and a possible prison sentence of their own.
More top news
Witness heard a noise which sounded like windows being blown out as the police entered the flat.
West Ham United Joint-Chairman David Sullivan and son Dave give homeless man who helped Manchester terror attack victims.
Photographs apparently showing bloodstained fragments from the Manchester concert bomb have been published in an American newspaper.