Billionaire entrepreneur Elon Musk was seen making his way through security inside a federal courthouse in Oakland, California on Tuesday (April 28).

Musk is in court for jury selection in a lawsuit against OpenAI CEO Sam Altman over allegations Atlman's company violated its founding mission in its high-profile restructuring to a for-profit entity.

Outside a courthouse garage, a security official told Reuters Altman was inside a white SUV and Musk in a black SUV as the vehicles entered the building.

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Musk, Altman arrive at court for opening arguments of OpenAI case

VIDEO SHOWS: ELON MUSK MOVING THROUGH SECURITY IN CALIFORNIA FEDERAL COURT AND VEHICLES BELIEVED TO BE CARRYING MUSK AND SAM ALTMAN ARRIVING AT COURT FOR MUSK'S LAWSUIT AGAINST ALTMAN AND OPENAI.

SHOWS: OAKLAND, CALIFORNIA, UNITED STATES (APRIL 28, 2026)(REUTERS - Access all)

1. VARIOUS OF ELON MUSK GOING THROUGH SECURITY AT FEDERAL COURTHOUSE

2. WHITE SUV BELIEVED TO BE CARRYING SAM ALTMAN ENTERING GARAGE OF COURTHOUSE

3. TWO MEN STANDING OUTSIDE COURTHOUSE

4. OFFICER OUTSIDE COURTHOUSE

5. VARIOUS OF BLACK SUV BELIEVED TO BE CARRYING MUSK ENTERING GARAGE OF COURTHOUSE

6. VARIOUS OF REPORTERS AND OTHERS OUTSIDE COURTHOUSE