Police have sealed off a section of shoreline on the south perimeter of Lough Neagh near Maghery.
It follows the discovery of a suspicious object. No roads are closed, but people are asked to avoid the area.
The Newtown Road at Camlough Lake, just outside Camlough, Co. Armagh, is also likely to remain closed for some time, following the discovery of a suspicious object earlier today.
Chief Superintendent Andy Freeburn South Area Commander said, “While our enquiries are at an early stage, the discovery of these two objects follow security alerts which caused disruption to the community in the Keady area last week.
“In addition to asking anyone with information about any of these incidents to come forward, I would also ask any member of the public who sees anything suspicious or out of the ordinary, whether that is a person, people, vehicle or indeed any objects that look out of place, to contact police straight away on 101 or 999 in an emergency.”
A report can also be made online using the non-emergency reporting form via http://www.psni.police.uk/