Delivery Truck Smashes Into Back of a UV Express Van

Just chanced upon a commotion on the intersection by the Public Market / 168 Mall. It turned out that a delivery truck has smashed into the back of a UV Express passenger van.

By the looks of it, the Back has been severely damaged. We are just curious if anyone had been hurt. 
Was the van already on a full stop when the truck hit it? or did it stop suddenly, not giving the truck enough time and distance?

One thing is for sure, at least one of these vehicles was still going fast in a place when they were supposed to slow down.

What if the one in fron had been a motorcycle or a tricycle?

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