A coach bus and a tractor-trailer collided on the New York State Thruway in Rockland County early Tuesday morning, leaving several injured and snarling the morning commute in the area.

A New York Trailways bus and a tractor-trailer crashed on the south-bound side of the New York State Thruway (Interstate-87), at 5:50 a.m. in Sloatsburg between Exits 16 and 15A.

There were approximately 20 people aboard the bus, accoding to New York State Police. and it was traveling from Kingston in Ulster County to New York City. The crash occurred on the driver's side of the bus, which was numbered 82016 on its roof.

Emergency crews had to rescue the bus driver from the wrecked vehicle. Crews also put a ladder through one of the bus' left-side window to extract the passengers.

The driver, along with at least six passengers, were transported to area hospitals with various injuries. The driver is said to be the most seriously injured of those hospitalized.

The condition of the driver of the tractor-trailer is unknown.

Traffic on the New York State Thruway was backed up for at least three miles and drivers are advised to seek alternate routes like Route 17 and 9-W.

The New York State Thruway is clear from Exit 17 onward on the south-bound side.

Clean-up of the accident began at about 6:30 a.m. and two lanes of the thruway approaching the crash were re-opened to allow vehicles to pass just before 7 a.m.

The cause of the crash is under investigation.