UPDATE: Klein Michael Thaxton has surrendered peacefully to police, just after 2 p.m., at Pittsburgh's Gateway Center. The standoff is over.
The armed suspect who has taken a hostage in a Pittsburgh, Pa. high-rise has been identified as Klein Michael Thaxton, 22.
He is currently negotiating with SWAT officers at the scene, which started shortly after 8 a.m. on the 16th floor of Three Gateway Center.
Thaxton has been posting emotional, misspelled tirades on Facebook during the alleged hostage situation.
"I cant take it no more im done bro," he wrote at about 9 a.m. "How this ends is up to yall bro real shyt."
At about 11:18 a.m., at the time of this article's writing, he wrote, "Stop postn silly shyt bruh i aint laughin rite now nigga!"
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Friends on the page are trying to console him.
"Boogie we love you," wrote Raven Thaxton on his Facebook wall. "Watevers goin on you can get through this .. i love you cuzzo stay strong."
Thaxton reportedly doesn't know his victim and is described as "ex-military" by police, according to the Associated Press. His Facebook page says that he's from the Pittsburgh area, but cops said he doesn't work at the building he's currently holed up in.
There are no reported injuries. Thousands of workers in the surrounding area were evacuated.
UPDATE: Police believe the hostage is the owner of CW Breitsman Associates, the business where the incident is taking place.
Thaxton has a criminal history. In March, he was arrested on suspicion of carjacking a motorist in McKeesport, and then giving chase when police tried to arrest him, according to the Pittsburgh Post Gazette.
This is a breaking news story, and an investigation is ongoing.