Eight defendants, said to be from the Busy Block gang, deny murder, conspiracy and violent disorder.
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Barry Rogerson, from Morpeth, was arrested and bailed on suspicion of violent disorder, police said.
Zak King, 22, of Street, Somerset, was also found not guilty of violent disorder.
An offence of violent disorder could carry a term of six months in jail.
They were arrested on suspicion of offences including wounding, violent disorder and criminal damage.
Mr Cameron told the Commons that anyone convicted of violent disorder would be sent to prison.
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Violent disorder means the insurance companies pay up and riot means the police force does.
FORBES: London Riots: Who Pays? Or, When is a Riot Not a Riot?
He said anyone charged with violent disorder should expect to be remanded in custody.
At an earlier hearing in May 2012, seven men were convicted of violent disorder.
One man was arrested for violent disorder following a march in London last month.
They are groups of eleven or fewer people engaging in violent disorder entirely independently of each other.
FORBES: London Riots: Who Pays? Or, When is a Riot Not a Riot?
Seven others, aged between 18 and 25, deny violent disorder, while five others have pleaded guilty to various offences.
More than 80 people arrested for violent disorder before a football match in Nuneaton have been released on bail.
It has been closed since the riots and nine people have been charged with offences relating to violent disorder.
Mr Cameron said anyone convicted of violent disorder would be sent to prison.
Tuesday's early morning arrests for violent disorder were carried out at homes in Tipton, West Bromwich, Brownhills and Acocks Green.
However, violent disorder is something which 11 or fewer people do, riot is something that 12 or more people do.
FORBES: London Riots: Who Pays? Or, When is a Riot Not a Riot?
Ten others, aged between 15 and 21, have also been charged with a range of offences, including violent disorder, affray, and criminal damage.
Of the 30 people arrested on the day of the protest, 27 were charged with public order offences, including violent disorder.
Sixteen men faced charges of violent disorder and attempting to wound with intent over Mr Barrett's death at Manchester Crown Court.
They were aged between 15 and 23 and were questioned on suspicion of various charges including violent disorder and criminal damage.
The Methodist President, Ken Lindsay, on Wednesday drew the line between non-violent disobedience and the violent disorder witnessed in recent days.
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In addition, a 16-year-old boy received a final warning for possessing cannabis and a 17-year-old boy was given a final warning for violent disorder.
Martin Hartshorn, of McCauley Street, Grimsby, is charged under the Serious Crime Act with encouraging or assisting the commission of violent disorder.
The force said one person was arrested on suspicion of violent disorder.
Of these, 64 were charged with riot and 23 with violent disorder.
The eight defendants all deny charges of riot and violent disorder.
Mr Meadows and Mr King will probably face another prosecution for violent disorder, although it is unlikely to take place before October, the court was told.
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Jurors have failed to reach a verdict on whether a student who suffered a brain injury at a university fees protest was guilty of violent disorder.
BBC: Alfie Meadows: Student protest jury fails to reach verdict
Six are charged with an arson offence and violent disorder and the seventh is charged with violent disorder after the riot at Ford Prison, on New Year's Day.
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