Officer blast death town searched
Detectives investigating the murder of Constable Ronan Kerr are carrying out searches in the town where he died.
Dissident republicans opposed to the peace process have been blamed for the booby trap device that exploded under the policeman's car in Omagh, Co Tyrone.
The same extremists are believed to be behind a 500lb van bomb police discovered near the border city of Newry, Co Down, on Thursday.
Police are continuing to question three men aged 26, 40 and 33 in connection with the April 2 killing after a court granted them extra time.
A Police Service of Northern Ireland spokesman said: "Police can confirm that searches are ongoing on the Drumnakilly Road in Omagh in relation to the murder investigation of Constable Ronan Kerr."
A peace rally on Sunday attracted support from across the community and was attended by friends and relatives of the murdered officer.
While the march was not party political, organisers said it was intended to send a message of support in the peace process.
The device that killed Constable Kerr detonated not long after a fun run had passed the scene.