The ambushed van was operated by prisoner escort firm GEOAmey and was on its way to a courtfrom privately-run HMP Altcourse near Liverpool.
Altcourse is run by G4S, the firm behind the Olympics security fiasco, and was the first designed, constructed, managed and financed private prison in the UK.
The Category B jail takes young offenders and adult male prisoners either sentenced or on remand from courts in Merseyside, Cheshire and North Wales and can hold up to 1,324 prisoners.
More top news
Colo became a mother of three, grandmother of 16, great-grandmother of 12 and great-great-grandmother of three.
The district's director of homeland security has said officials are planning for 800,000 to 900,000 people to attend the ceremony.
The Supreme Court is set to decide on whether disabled travellers are legally entitled to have priority use of wheelchair spaces on buses.