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The Federal Motor Carrier Safety Administration (FMCSA) is launching an investigation into the fatal Florida Turnpike crash that killed three people in Fort Pierce last week.

Secretary of Transportation Sean Duffy said the investigation will look into both the driver and the motor carrier, White Hawk Carriers, Inc.

Harjinder Singh, the semi-truck driver accused of making an illegal U-turn on the Florida Turnpike , appeared in court Tuesday.

Singh was in California court for an extradition hearing. Authorities say he flew to Sacramento after the Turnpike accident and was later arrested.

WATCH: Harjinder Singh appears at extradition hearing Semi-truck driver appears in Californ

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