TMZ has obtained the 911 call placed moments after former U.S. Commerce Secretary John Bryson allegedly committed a hit-and-run last month ... then suffered a seizure, and crashed his car AGAIN.

It all unfolds during the phone call -- placed by a passenger in the first car Bryson allegedly hit.

The passenger tells the operator, "We have a drunk driver that just hit us and fled. He hit us twice, we're pursuing him now." During the pursuit, the driver says Bryson hit a second car.

After the second accident, 68-year-old Bryson was transported to a nearby hospital, where he was treated and released the following day.

Bryson was cited for hit-and-run in connection with the first accident -- but as we reported, the D.A. rejected the case and no charges were filed.

Despite the passenger calling Bryson a "drunk driver," cops say drugs or alcohol do NOT appear to have been a factor in the accidents. Only minor injuries were reported.

U.S Commerce Secretary John Bryson won't face charges after allegedly crashing into two cars in L.A. last month ... and fleeing the scene -- because the D.A. has rejected his hit-and-run case.

As we previously reported, Bryson was found unconscious in his Lexus after allegedly smashing his Lexus into two cars -- miles apart from each other.

According to the D.A.'s charge evaluation sheet, doctors believe Bryson suffered his seizure following the first accident -- and the disorienting experience caused accident #2.

The D.A. says Bryson's blood tested negative for alcohol and controlled substances, but positive for a low level of Ambien -- too low for a DUI charge.

Bryson had been cited for hit-and-run after he was taken to a nearby hospital following the accidents -- but today, the D.A. rejected the case due to insufficient evidence ... both for hit-and-run and DUI.

Translation: Bryson's in the clear.

U.S Commerce Secretary John Bryson reportedly suffered a seizure in L.A. Saturday after smashing his Lexus into another car -- and fleeing the scene.

According to reports, Bryson then hit a SECOND car near the scene of the first accident -- and was found soon after, unconscious behind the wheel. It's unclear exactly when Bryson suffered the seizure, before or after the second accident.

68-year-old Bryson was transported to a nearby hospital, where he was treated and released Sunday.

Bryson has been cited for hit-and-run in connection with the first accident. The case hasn't been sent to the D.A. yet, so it's unclear if he'll be prosecuted.

Cops say drugs or alcohol do not appear to have been a factor. Only minor injuries were reported in the car accidents.