Rob Pulling wore an improvised Ku Klux Klan mask

The force, which is expected to defend its record on fighting racism after Tuesday's programme, confirmed the second suspension on Wednesday.

It means eight officers have been suspended so far. The others are five from Greater Manchester, and one from Cheshire Constabulary.

The programme, The Secret Policeman, was broadcast on Tuesday night. Scenes included an Asian recruit from the north Wales force being treated with hostility by some of his fellow trainees.

One of the North Wales officers named in the programme is Pc Rob Pulling, who is seen dressing in an improvised Ku Klux Klan hood.

He works in the force's central division, which covers towns like Rhyl, Colwyn Bay and Llandudno.

Pc Pulling was suspended pending an investigation by North Wales Police before the programme was broadcast.

During the screening, when asked by undercover reporter Mark Daly if he was capable of killing an Asian man, Pc Pulling replied: "I've got it in me...it's a hatred thing."

Rob Pulling has been suspended from North Wales Police

Pc Pulling and others are heard criticising the only Asian recruit in the intake who is also now with North Wales Police.

When the man is moved back in the course, some of the trainees are heard to cheer.

North Wales Police are expected to stress they have been working hard to tackle racism.

In a statement acting deputy chief constable, Clive Wolfendale, said: "If the BBC has evidence of racist behaviour by a North Wales officer, we would want to act on that immediately.

"There is no place for racists here."

In a news conference on Wednesday, he is also expected to launch an attack on the methods used by the makers of The Secret Policeman.

Mr Wolfendale is angry that the force was not given a copy of the programme to view prior to its screening.

The programme used secret filming at the police training college

The Police Federation's north Wales secretary Richard Eccles told Radio Wales on Tuesday that North Wales Police had "no visible problem" of racism, and that measures were in place to deal with it.

But Naz Malik, of the All Wales Ethnic Minority Association, told BBC Wales he was annoyed by the racism shown in the programme.

He said: "We know that the police in south Wales and north Wales have worked an awful lot and we've worked with them for the last three years to make sure that attitudes within the police service change.

"So we find it rather disturbing and to an extent annoying as well, that something like this has been allowed to pass unnoticed so far."

Filming 'to be welcomed'

On Wednesay, Alison Halford, a former member of the North Wales Police Authority, and former assistant chief constable of Merseyside, said the programme's content was very worrying.

She said: "Something has gone very dramatically wrong with the selection process.

"Lets hope its a real horrible one-off and it doesn't happen again."

Claire Curtis-Thomas, a member of the Commons Home Affairs select committeee, told BBC Wales she believed the secret filming tactic was justified.

She said: "Sometimes covert activities of this kind is to be welcomed.

"It's an awful reminder of how far we have to go but I think the police are genuinely trying to tackle this problem.

Criminal charges

"It remains a serious problem with a tiny minority of police officers, who are doing a huge disservice to the vast majority of police officers who are seeking to do their job in the best way that they can."

In the making of the documentary, reporter Mark Daly posed as a probationary officer with Greater Manchester Police to gather the footage for the programme.

He faces criminal charges over his move to infiltrate recruits at Bruche National Training Centre in Warrington, Cheshire, to assess whether institutional racism still exists within police ranks.

Mr Daly spent five-and-a-half months with Greater Manchester Police and could face charges of obtaining a pecuniary advantage by deception and damaging police property.

He is due to answer bail in November.

Investigation

The BBC has said any pay Mr Daly received has been kept in a separate bank account and was to be returned to the force at the end of the investigation.

As well as Pc Pulling, five Greater Manchester Police trainee officers and one from Cheshire have also suspended by their forces after being filmed making racist comments.

Assistant Chief Constable Alan Green of Greater Manchester Police said the force expected to take further action once it received extra material from the BBC.

He said: "Racism has no place in Greater Manchester Police and we are totally committed to tackling it both inside and outside the force.

"Our investigation into the issues, which is being independently supervised, will be thorough."

His counterpart in Cheshire, David Green, said the racist conduct shown in the programme was "abhorrent".