Investigation underway after long fall from under-construction building

(Updated at 10 a.m.) A person has life-threatening injuries after a long fall in the Ballston area.
The incident happened around 7 a.m. at the intersection of Fairfax Drive and N. Quincy Street. Police initially responded there for a trespasser climbing a rope at the construction site.
While on scene, an officer told dispatchers that the person appeared to be stuck part-way up the under-construction building and, a short time later, that they fell about eight stories to the ground below.
Firefi