Published: Aug 24, 2012 8:14 PM EDT
Updated: Aug 25, 2012 6:30 AM EDT

LIVERMORE, Calif. (AP) - Police say a man severed his foot in a California parking lot after sticking his leg out the door of his moving BMW. Authorities then arrested him on suspicion of drunken driving.

The Contra Costa Times reports (http://bit.ly/NPF8nK) 31-year-old John Buna severed his foot at the ankle Wednesday after hitting it on a cinder block during a reckless drive in a Livermore parking lot.

Police say a woman with Buna reported she exited his two-door BMW because she was frightened of his driving.

Authorities say Buna stuck his foot out the driver's side door as if he was exiting the car, but instead accelerated suddenly, crushing the foot between the car and the cinder block.

Police say Buna parked his car, and the woman called for help.

Police are still waiting for Buna's blood-alcohol results.