An Amtrak train traveling from Washington, D.C., to New York derailed late Tuesday in Philadelphia. Here's what we know so far about the crash.

1. The train may have been traveling over 100 mph. In an initial analysis of the surveillance video, the train may have been traveling around 106 miles per hour prior to the curve with a speed limit of 50 miles per hour, according to The Associated Press.

>> PHOTOS: Fatal Amtrak derailment in Philadelphia

2. Numerous passengers were hurt or killed. Of the 243 people on board Train 188, at least eight have died and more than 200 were injured – several critically, according to The Associated Press. So far, six victims have been identified, including AP video software architect Jim Gaines, 48; U.S. Naval Academy student Justin Zemser, 20; Wells Fargo executive Abid Gilani; ApprenNet CEO Rachel Jacobs, 39; and Medgar Evers College Dean of Student Affairs Derrick Griffith, 42. Bob Gildersleeve of Maryland had been unaccounted for, however Philadelphia Mayor Nutter announced at a recent press conference that all passengers have been accounted for.  There is no word on Gildersleeve's condition as of Noon ET.

3. The train's engineer has been identified. New York resident Brandon Bostian, 32, reportedly spoke with investigators after the crash when he was treated at a hospital but declined to make a formal statement to police and requested a lawyer.

>> RELATED: Brandon Bostian was engineer of Amtrak train that crashed

4. The train's black box has been found. In a press briefing, Philadelphia's mayor said the train equivalent of a black box has been recovered from the wreckage of the crash  according to The Associated Press.

5. Investigators don't yet know what caused the crash. Officials with Amtrak, the National Transportation Safety Board and the Federal Railroad Administration are headed to the site where the derailment occurred at 9:28 p.m. Tuesday in the city's Port Richmond area.

Janna D'Ambrisi, a passenger, said the train felt like it was traveling "a little too fast around a curve," CNN reported.

"I was thrown into the girl next to me, sitting in the window seat," she told CNN. "The train started to tip that way, to the right. And people on the other side of the train started to fall on us."

>> RELATED: Social media images: Amtrak train crashes in Philadelphia

6. Travel routes are affected. The rail corridor between New York and Washington remained shut down Wednesday, and roads  near the site were blocked off, The Associated Press reported. "There's no circumstance under which there would be any Amtrak service this week through Philadelphia," Mayor Michael Nutter said.

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7. Is this the first train crash in the area? No. According to ABC News, a Pennsylvania Railroad train crashed in northeast Philadelphia in September 1943. The accident killed 79 people and injured 117.

8. Where can I find more information? Amtrak is providing updates on its website and blog. People with questions about friends and family members on the train can call 1-800-523-9101.