'EXPECT A KNOCK AT THE DOOR'

That's the message from Chief Inspector Jason Murphy, speaking as the first anniversary of Constable Stephen Carroll's murder approached.

In a wide ranging interview with the 'MAIL', Mr Murphy said the net was closing in on those involved in terrorist activity.

"The law does not discriminate - if you're involved you're involved, it's as black and white as that," said Mr Murphy.

"Whether you are preparing hoax devices, storing firearms, disposing of evidence or directly carrying out attacks we will not leave a stone unturned and all links will be investigated.

"Our investigations are not simply about arresting the one or two people who actually carry out an attack, but everyone involved.

"My message to those connected in any way to terrorist activity is to stop what you're doing and consider the consequences. If you persist, expect my officers to knock on your door."

Chief Inspector Murphy talked about the events running up to and following the murder of Constable Carroll in Craigavon one year ago.

The area commander talked to the 'MAIL' about the devastating and tragic events of March 9 last year following the murder.

For him and many of his officers it was the first time they had lost a colleague, murdered in the line of duty.

He spoke passionately about the pride he had in the dedication and commitment of police officers in the immediate aftermath of the murder, the speed with which the investigation took off and the huge outpouring of sympathy from across the world.

He talked about working under the high threat level and the unique policing situation officers face in Craigavon every day.

Mr Murphy also spoke about the progress the police had made in the past year in creating strong links within the community, particularly in nationalist and republican areas.

He added: "It's totally bizarre to talk about the positives arising out of the murder of a colleague, but there have been significant steps forward in policing."