Police say a device found in Strabane was an attempt to kill or injure officers.
One of two devices found in the Ballycolman Avenue has been declared a hoax.
British army technical officers (ATO) are continuing to examine a second device found at the scene.
Ten homes and 150 children at a nearby Gaelscoil were evacuated during the alert.
It follows a report to the PSNI last night that a device thrown at a police vehicle had failed to explode.
Strabane Chief Inspector Andy Lemon said one of the devices bore the hallmarks of “a deliberate attempt to kill or injure” police officers or the public.
In is the second time dissident republicans in the North West have attempted to kill police officers.
Two weeks ago, police said a viable device found in Ballyarnett Village in Derry was also attempt to lure officers to their death.
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