Michael Phelps Involved in Three Car Smash Up

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UPDATE: Cops tell TMZ alcohol was NOT a factor in the crash. We're told cops interviewed Phelps after the accident and determined that a field sobriety test was not necessary.

We're told Michael refused medical treatment and left in a "personal vehicle."

Michael Phelps was just involved in a three-car accident in his hometown of Baltimore.

Phelps reportedly emerged from the wreck unscathed, but a woman in the other car was shaken up and taken to a local hospital. We're told she complained of "head and arm pain."

The accident occurred around 9pm local time.

A police spokesman says the Olympic Gold Medal winner was driving a Cadillac Escalade, which collided with a Honda accord.

We're told by witnesses on the scene -- the two cars collided after someone ran a stoplight -- and then hit a third car that was not moving at the time.

Police are investigating the cause of the crash.

One of the local papers is reporting that a passenger in Phelps' car was also injured, but it's unclear as to the extent of that person's injuries.

We're told there is already a tow-truck on scene removing Phelps' ride. We're told Michael's car received "heavy damage."