Breaking: Train Hits Cars Outside New York City, Bursts Into Flames

This is a breaking story. Please check back for updates. 
UPDATE, 9:24 p.m.: Reports are now confirming that six people were killed in the crash.  8:20 p.m: A Metro North train collided with two cars at a crossing outside of New York City and all three burst into flames, according to reports. Police are calling the crash a "mass casualty incident."  No deaths have been reported at this point, though there appear to be multiple injuries. The incident took place at about 6:30 p.m. during evening rush hour, and as many as 800 people were on board the train. Overhead photos show a fire and massive emergency response. Parts of the Harlem Line of the Metro North Railroad have been closed after the crash, which occurred in the town of Valhalla. Images of the crash, showing train cars engulfed in flames, are flooding social media.