One trucking company is challenging an out-of-service order it received in August from the Federal Motor Carrier Safety Administration, following a fatal accident.

Nevada-based National Distribution Services was ordered to cease operations following an investigation after one person was killed and another hurt in May when a tanker exploded at the company’s Corona, California terminal.

FMCSA claimed National leases the tankers from a business it has connections with, TankServices LLC, and did not properly inspect or test the tankers in accordance with federal regulations.

The agency also said the explosion of the tanker was caused by it not being properly purged and cleaned before it was worked on and at least one of the people performing the work when it exploded was using equipment owned by National and was paid by the company.

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