OMAHA, Neb. -- NASCAR driver Carl Edwards was released early Monday from an Omaha hospital after being injured Sunday night in a dirt track race in nearby Greenwood, a hospital spokeswoman said.

Details of the injury were not immediately available. Edwards' younger brother, Kenny Edwards, told the Omaha World-Herald it could be a dislocated thumb, caught in the steering wheel during a crash.

Edwards hit the back of another car that had spun out in the third lap, starting a 10-car pileup that battered his car. Edwards left the 25-lap race at I-80 Speedway in the back of an ambulance.

A prior rain delay of 45 minutes had left a slick surface on the track.

Lora Ullerich, a spokeswoman for Lakeside Hospital in Omaha, confirmed Monday that Edwards had been treated and released, but did not give further details, citing confidentiality rules. Roush Racing spokeswoman LeAnne Howell said Roush officials had no comment.

Edwards, ranked fifth in the Nextel Cup standings and leading the Busch standings, was scheduled to be in Milwaukee on Monday for performance testing.

He raced in the late-model event with his brother and father, Carl Edwards Sr. Edwards finished sixth at the Busch Gateway 250 on Saturday night, leading for seven laps but rubbing against the wall late.