Two suspect devices have been found by police following searches in the Ballycolman Estate.
The alert was raised this morning following reports of a suspect device being thrown at a patrol car.
A number of homes have been evacuated as a result.
Earlier it was decided to evacuate 150 staff and children from the Gaelschoil in Strabane as a result of the alert.
Cllr Brian McMahon, who works in the school, says the incident created a huge amount of fear for staff, children and parents:
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