They were the follow-up weapons, to be used by the Muzzies to butcher as many people as possible after the Muzzies got out of the vehicle.
That is the MO described in Al Qaeda’s online jihad terror training magazine “Inspire”
Run pedestrians down then finish the work with a knife or guns
which was downloaded by over 55,000 British muslims in a year
Or was it in a week
http://freerepublic.com/focus/bloggers/3537516/posts?page=6