Mr McDonald was also in the van, travelling to face sentencing for conspiracy to commit robbery.
He was being transported to Manchester Crown Court to face sentencing for conspiracy to commit robbery.
MacDonald was on his way to court for sentencing for conspiracy to commit robbery.
Joseph Upton, 39, of Murrow Lane, Parsons Drove, Wisbech, Cambridgeshire, had admitted to conspiracy to commit robbery.
They are being held at various south London police stations on suspicion of conspiracy to commit robbery.
Along with a fifth man, the men have been charged with conspiracy to commit robbery across the Midlands between July and October.
Mr McMullen faces charges of conspiracy to kidnap, conspiracy to commit robbery, conspiracy to commit arson, possession of a firearm, and other offences.
The 20-year-old was sentenced in his absence on Friday to seven years and 10 months in prison after previously pleading guilty to conspiracy to commit robbery following his role in a series of raids on pawnbrokers' shops.
Before his escape, Mr McMullen was being transported from HMP Altcourse in Fazakerley, Merseyside to court to face charges of conspiracy to kidnap, conspiracy to commit robbery, conspiracy to commit arson, possession of a firearm, and other offences.
Among other charges, each teen is accused of aggravated assault, criminal attempt to commit armed robbery and first-degree cruelty to children.
Moran, 31, had been convicted in absentia of conspiracy to commit armed robbery for the 2005 holdup of a Royal Mail vehicle.
He was convicted in his absence of conspiracy to commit armed robbery.
He was extradited to Britain where he was sentenced to nine years and eight months in jail for conspiracy to commit armed robbery and seven months for jumping bail.
Mr Dewani faces charges of murder, conspiracy to commit murder, robbery with aggravating circumstances and obstructing the administration of justice - all of which he denies.
The Bristol businessman faces charges of murder, conspiracy to commit murder, robbery with aggravating circumstances and obstructing the administration of justice - all of which he denies.
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Officers believed Mr Rodney, Wesley Lovell and Frank Graham had machine guns and were on their way to commit a drugs-related armed robbery, the inquiry heard.
Shoji Sakurai spent 29 years in jail for a robbery-murder that he didn't commit.
Lee Bailey, found her guilty of armed robbery and the use of a firearm to commit a felony.
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