California police say a man was killed Wednesday in a highway crash after a truck driver fell asleep behind the wheel.

A box truck involved in the crash was carrying "a very special load" for Apple, according to NBC's Bay Area affiliate.

Sources told NBC the two men in the truck were armed security guards transporting products for Apple.

Apple is known for being very tight-lipped and keeping its products and company documents under tight wraps.

A truck reportedly transporting "highly sensitive products" for Apple was involved in a fatal crash this week in California.

Both Apple and the California Highway Patrol did not respond to a request for comment.

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