By David Hunter
Two men have been arrested over the murder of PSNI Constable Ronan Kerr.
The 25 year old died in a booby-trap car bomb in Omagh on 2 April 2011.
Detectives from the Serious Crime Branch detained two men under the Terrorism Act on Tuesday.
A 27 year old man was arrested in Omagh and a 40 year old man was brought into police custody from prison.
They have both been taken to Musgrave’s Serious Crime Suite where they are currently being questioned by police.
Mr.Kerr was the second serving police officer to be killed since the Good Friday Agreement in 1998.
Constable Stephen Carroll shot dead after terrorists lured police to a call-out in Craigavon on 9 March 2009.