Eyewitness accounts indicate the small plane hit the Northwest Austin office building dead-center at full speed. The building, which houses an FBI office, is damaged substantially. No word on injuries.

Update: An Austin radio show had a caller that believes the man piloting the plane may be her recently estranged son-in-law whose wife recently left him, taking the children. He apparently is suspected of burning the family home down last night.

Update II: Austin NBC affiliate KXAN is reporting on the house fire in North Austin, and people in the neighborhood there are saying there was a domestic dispute, and that the husband did have an airplane.

Update III: Pilot witness said the plane appeared to be a Piper Cherokee 140.

Update IV: MSNBC is reporting that NTSB says the crash "may be intentional."

Update V: CNN reporting that plane "was stolen." Plane not stolen, according to new reports.

Update VI: Multiple eyewitness accounts describe plane as 'flying low, and at full throttle.'

Update VII: Fox News report here.

Update VIII: Here is the Austin American-Statesman's report, which is the most substantial so far.

From the Statesman report: (emphasis added)

The plane did not appear to be in distress, was traveling quickly and did not appear to be looking for a place to land, Zunker said. "It wasn?t like it was trying to land on the highway, which is what you'd expect it would've done. I mean, there's roads right there."

... [one person] driving to work on the U.S. 183 flyover near MoPac Boulevard (Loop 1) when he said he saw a small plane, very low, flying over the highway. He said he saw it then bank heavily to the right before heading into the building.

"There was a huge fireball. It went right into the building," Thurman said.

Update VIX: Photos from Austin American Statesman here.

Update X: From a friend and former colleague who now works for the IRS in that office building:

I was not in the office today when the plane crashed in to my building. It hit my floor right next to our room. My manager is missing. It hit our breakroom (I think) and my manager's office is just on the other side of the wall from the breakroom. And my desk was just 20 feet away from his office.

Based on news that a man stole a plane after burning his house down - I think this may have been intentional. I could be wrong, but I am a little freaked out.

Anyway, I'm ok. I just hope my manager is fine. He's a good man.

Update XI: Hero in Austin:

Fox News is interviewing a guy (former military) named Robin DeHaven who works for a glass replacement company named Binswanger.

He drove to the building after seeing plane and smoke from the crash, put his ladders up to the building -- and when he saw that the people at the window were 'panicked' -- climbed into the building, and helped get five people out.

Incredible.

My friend writes, after a call to one of her colleagues:

I know the people he rescued. I used to be in that room. Thank the gods for people like him.