Three people have now been confirmed dead and four children injured in yesterday’s horror smash in Co Tyrone.
A specialist PSNI investigation team is today trying to establish what exactly caused the crash between two vehicles on the main road between Cookstown and Dungannon around 3.30pm.
It’s understood that two vehicles were involved in a head on collision.
The drivers of the two vehicles, a woman in her 80s and a man in his 20s, and a woman in her 50s who was a passenger, were killed.
The Northern Ireland Ambulance Service deployed two rapid response teams and several emergency crews after receiving a 999 call at 3.29pm.
After assessment and initial treatment at the scene, four children and a woman in her 20s were taken to hospital in Belfast.
A large section of Dungannon Road has been closed and the PSNI said it is likely to remain closed for some time.
Forensic officers worked at the scene until late last night to try to establish what happened.
Police have appealed to anyone who was in the area at the time and witnessed the collision or has dashcam footage or any other relevant information to contact them.