Detectives investigating the murder of Garda Adrian Donohoe have carried out a series of searches in the area where he was killed.
Several raids were carried out across the Carlingford region in what officers said was a follow-up to operations north of the border earlier this month.
The Police Service of Northern Ireland (PSNI) seized mobile phones and documents when they searched four houses in the south Armagh region on April 8.
Father-of-two Detective Donohoe was shot in the head outside the credit union in Lordship, on the Cooley peninsula, on January 25 as he escorted cash collections from the premises.
Last week a court heard how the chief suspect in his murder has fled to the US.
Gardai also said they wanted to renew appeals for the public to come forward with any information they may have in relation to the killing.
A gang of five from the south Armagh region were involved in the credit union hold-up and the murder.