Police say they are responding to the incident in the Highfield Close area of Gortin Road on Saturday afternoon.
UTV’s News Editor Chris Hagan wrote on Twitter: “Residents in Highfield area off Gortin Rd in Omagh report hearing a loud blast. Suspected under-car booby trap bomb attack.”
Update From the updated BBC report
A 25-year-old police officer has been killed after a bomb exploded under his car in Omagh, County Tyrone.
The device exploded under the vehicle outside his home in Highfield Close, off the Gortin Road, just before 1600 BST on Saturday.