The PSNI landrover going back towards Strabane after being in Lifford this morning.
BREAKING NEWS: This is the amazing picture which shows the PSNI crossing the border into Lifford this morning.
The picture of an official marked police landrover was taken by local resident Christy Gallagher around 11am.
Donegal’s Chief Superintendent Terry McGinn has been made aware of the incident and has received a copy of the picture.
Local Independent county councillor Frank McBrearty has called for a full investigation into the matter.
“This is an international incident and it has to be fully investigated.
“Innocent people could have been hurt if dissident republicans had got word of this incident and opened fire on this landrover.
“The PSNI is not permitted to cross into Donegal and members of An Garda Siochana are not permitted to travel into Co Tyrone.
“A full investigation must be carried out into what has happened here. This is a serious breach of the protocols which exist between our two police forces,” he said.