The National Highway Traffic Safety Administration has laid off 4 percent of its workers, a transportation official said. The agency has raised questions about crashes involving Tesla’s self-driving technology.

Elon Musk accused the National Highway Traffic Safety Administration of holding back self-driving technology. Elon Musk’s cost-cutting team is eliminating jobs at the vehicle safety agency that oversees Tesla and has launched investigations into deadly crashes involving his company’s cars.

The Tesla CEO has said the National Highway Traffic Safety Administration is slowing progress on autonomous vehicles.

Elon Musk's team is eliminating jobs at the vehicle safety agency that launched investigations into deadly crashes involving his Tesla company's cars.