Explosive detection dogs and 80 P.S.N.I.officers involved in 'New I.R.A.' raids
Specialist search officers and neighbourhood officers took part in the searches in the Creggan estate in Londonderry on Monday morning.
Superintendent Gordon McCalmont confirmed the details of the searches during a press conference at Strand Road P.S.N.I. Station.
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Hide AdThe searches are in connection with a failed mortar bomb attack in Strabane, Co. Tyrone at the weekend.
The P.S.N.I. believe the group calling itself the 'New I.R.A.' were responsible for the attack.
"Our assessment is that this group is concealing bomb-making materials in this area [Creggan]
"We have a number of areas of focus, however there is no definitive and no guarantees.
"However, our chances are improved by support and information from the community," said Superintendent McCalmont.