NORWALK - Investigators are being to piece together what happened early this morning that left at least 14 people dead and 19 injured after their tour bus tipped over on the New York State Thruway.

Click "NEXT" below your video player for Chopper 12 footage of the crash and for a press conference about the crash.

Police say that the bus, heading from Mohegan Sun Casino in Conn. to Chinatown in Manhattan, tipped over and slid into an overhead sign support pole, slicing the bus in half, causing many of the injuries.

The bus company, Worldwide Tour, says it is cooperating in the investigation.

The driver of the bus says that he swerved to avoid a tractor-trailer, causing the bus to tip over and slide into the pole. However witnesses say that the bus was moving at a high rate of speed and operating erratically.

Police say they have located the truck in Farmingdale, N.Y and secured it, pending an investigation.