Exactly two years after his son crashed at Suzuka, Jules Bianchi's father is still seeking answers and justice.

This week marks the second anniversary of Bianchi's crash at the wheel of a Marussia on a slippery track in fading light in the 2014 Japanese Grand Prix.

He died eight months later from the injuries, and now Bianchi's father Philippe is defending legal action the family is taking against F1 and the FIA.

"It is obvious that we seek to understand, because the evidence that was given to us and the tiny investigation that was done is not sufficient," he told French broadcaster Canal Plus.

Mr Bianchi defended the legal action he is taking against the sport.

"I think this was not a normal circumstance, so we must not say that Jules had responsibility in this accident," he said.

"I also want that it doesn't happen again, but what do we most lack today? It is justice, and truth. That's the first point, because it's difficult to mourn something in the conditions that we are being asked to. It's almost impossible.

"We have clearly identified that there were significant errors that were made."

Mr Bianchi alleges that F1 authorities are even "hiding something".

"We have asked for some time for images from Jules' on board camera for example," said Philippe. "For official images from FOM to understand what happened, and we never managed to get them."

"We just want Jules's death to be respected," added Mr Bianchi, who said he has not watched any grands prix since that fateful day in Japan, two years ago.

"There is a huge lack of our lives and this is a terrible date for us. Nothing will ever be the same."