A bomb was left on the doorstep of an independent member of Strabane District Policing Partnership, police have said.
The bomb was left on Arthur McGarrigle's doorstep
Arthur McGarrigle said his son, who is in his 20s, saw two youths leaving the bomb at about midnight, and lifted it without realising the danger it posed.
Mr McGarrigle said the device could have severely injured his family and caused extensive damage.
"The indication is that it was a viable device... it certainly wasn't left at my front door as a gift," he said.
A number of items were taken away for further examination after what was the third alert in the area in four days.
On Monday, a bomb was defused outside the Sion Mills home of former DPP member Mary McCrea.
Arthur McGarrigle's son picked up the device
On Sunday, a device was found at another home nearby.
Chairman of Strabane DPP Eugene McMenamin lives directly across the street and has also been attacked before.
Mr McMenamin said the attacks only made DPP members more determined.
"Attacks like these only strengthen our resolve to continue," the SDLP assembly member said.
"I admire the independent members, as well as the elected members of the District Policing Partnerships, who have had the guts to stick their necks out over the years for the betterment of everyone within our small island."