Toto Wolff urges Formula One for transparency in Red Bull's Christian Horner investigation

Horner has been cleared to continue as Red Bull team principal following an internal probe into "inappropriate behaviour" towards a female colleague.

Horner was on the Red Bull pit wall on Thursday for both practice sessions of the new season.

"I am pleased that the process is over and I cannot comment about it," he told Sky Sports. "I am focused on the season ahead. Within the team it (the unity) has never been stronger."

Red Bull Racing's parent company, Red Bull GmbH, said it was confident the investigation into Horner had been "fair, rigorous and impartial" but added that the report – understood to stretch to 150 pages – is "confidential".

It is understood that neither Formula One's owners, Liberty Media, nor its regulator, the FIA, has seen the report.

However, there were growing calls in Bahrain on Thursday night for Red Bull GmbH to share the details of their investigation.

"I just read the statement, which was pretty basic," said Wolff. "My personal opinion is we can't really look behind the curtain.

"There is a lady in an organisation that has spoken to HR and said there was an issue and it was investigated and yesterday the sport has received the message that it's all fine, we've looked at it.

"I believe with the aspiration as a global sport, on such critical topics, it needs more transparency and I wonder what the sport's position is?

"We're competitors, we're a team and we can have our own personal opinions or not. But it's more like a general reaction or action that we as a sport need to assess, what is right in that situation and what is wrong.

"Are we talking with the right moral approach, with the values based on the speculation that is out there?

"As a sport, we cannot afford to leave things in the vague and in the opaque on critical topics like this, because this is going to catch us out."

McLaren CEO Zak Brown agreed with his Mercedes counterpart.

"It's the responsibility ultimately of the organisers of Formula One, the owners of Formula One, to make sure that all the racing teams and the personnel and the drivers and everyone else involved in the sport are operating in a manner in which we all live by," said the American.

"I don't think it's the teams' roles and responsibilities. That's up to FIA and Formula One to ultimately decide and ask what they feel gives them the level of transparency they need to ultimately come to their conclusion and we just have to count on them that they fulfil that obligation to all of us."

Media have contacted Formula One and the FIA for comment.

Horner, who has protested his innocence throughout, was questioned by a lawyer for eight hours earlier this month at a secret London location.

He has been Red Bull team principal since they entered F1 19 years ago and is the longest-serving boss on the grid.

He has overseen seven drivers' world championships and six constructors' titles.

Red Bull have dominated the sport in recent seasons and last year won 21 of the 22 races, with Dutch driver Max Verstappen setting a new record for 10 consecutive victories as he wrapped up his third title.

Horner, who is married to former Spice Girls singer Geri Halliwell, was awarded a CBE for his services to motorsport in the New Year Honours.

Read More: Christian Horner declares Red Bull's strength unmatched, after cleared of allegations (planetsport.com)