What you see here is a prisoner, being transported from the courthouse to jail, in the middle of his (successful) escape. Halifax police have become a bit of a laughingstock this past year or so due to the number of criminals who have managed to just "walk away" from custody. This guy had to put a little more effort into it...
...and yes, that van is indeed in motion... the driver apparently didn't even notice.
(Halifax Chronicle-Herald)