The 72-year-old suffered multiple gashes to his head and was left bleeding after the crash of a vintage two-seater plane, according to the TMZ celebrity website, publishing a picture of the downed plane, its nose cone ripped open.
A Los Angeles Fire Department spokesman, who did not identify Harrison, said the pilot of a single-engine plane was critically injured in the crash yesterday.
"We cannot disclose any of our patients' names," spokesman Erik Scott told AFP, recounting the early afternoon crash at the Penmar Golf Course in Venice, southwest of Los Angeles.
"Fortunately no one (else) was injured and the NTSB will perform an investigation," he said, referring to the National Transportation Safety Board.
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The KTLA television station cited witnesses as saying Ford was helped out of the plane, and that he could use his legs.
It showed video footage of the plane, which gashed a stretch of grass on the golf course before coming to a halt the right way up.