Police in the North said today they were stepping up their activity following the discovery of a number of real and hoax explosive devices.
In some cases, officers will be supported by the British army, a PSNI statement said this morning.
Assistant Chief Constable Peter Sheridan said: "People will notice an increase in the number of police on the streets and roads between now and Christmas.
"The operation will involve vehicle checkpoints and possibly searches of vehicles and people. We ask the public to co-operate with us. The only people we want to disrupt are the criminals who are determined to disrupt life for everyone else."