Why is a US government truck transporting a rocket vehicle that crashed into a house?

US President Donald Trump ordered the National Transportation Safety Board to investigate the May 4 crash of a government truck carrying a cargo rocket transportation vehicle, according to the White House.

Trump’s order to the NTSB comes amid questions about how a US Navy nuclear-powered cargo vehicle that was transporting nuclear fuel from the nuclear weapons plant at Yucca Mountain crashed into the home of a retired Army colonel.

The Associated Press is not naming the retired colonel because he is protected by a federal law that bars people from being named in court proceedings against the president.

The retired colonel, who lives in rural Pennsylvania, was not injured in the crash, but the vehicle was damaged in the collision.

It was unclear how much damage the truck sustained.

The White House says Trump is aware of the NTSBs investigation, which is examining how the crash happened.

The NTSBs said it was not investigating any other accident involving a US military transport vehicle.