Police Service of Northern Ireland (PSNI) officers in Derry have arrested a man after discovering a mortar bomb and a launcher tube.
The device was found in the garage of a house on Elmwood Terrace in the mainlynationalist Bogside area.
The PSNI were today linking the find to dissident republican paramilitaries.
A number of families on Tír Chonall Avenue and on Elmwood Avenue were evacuated while a security operation was carried out.
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Police said they were stoned and petrol bombs were thrown during the operation and follow-up searches.