Latest: Tyrone woman with 'heart of gold' still critical with 'extremely grave' injuries after drill attack

Latest: A woman who was attacked with a drill in the North remains in a critical but stable condition in hospital tonight.

Update - 9.41pm: A woman who was attacked with a drill in the North remains in a critical but stable condition in hospital tonight.

A teenage boy was arrested after the 38-year-old woman suffered a "very serious" head injury, police said.