The PSNI say there was no "criminal act" involved in an incident at a house in Coalisland when a woman was seriously injured.
Following a police investigation into the circumstance of the incident at Mourne Crescent on Monday it was established that the womn was injured as a result of a fall.
There were reports that she had fallen from a window of the house.
Four people - three men and a woman - who were assisting police with their enquiries, have now been released unconditionally.
The woman was taken to Craigavon Area Hospital following the incident and her condition was reported as critical.