In the North - the murder of Constable Ronan Kerr has been linked to 9 other incidents.
They include an arms find, attempted murders, armed robberies and other terrorist attacks.
Constable Kerr, who was 25, was killed when a booby trap bomb exploded under
his car in Omagh in April last year.
Today, PSNI Detective Superintendent Raymond Murray appealed for information about 11 cars and one unidentified man in the area before the murder, and for information about the killers......