So far I've heard of 3 reports where a "white truck" was supposedly seen, and the descriptions have varied, from an Isuzu box truck, a white Dodge Caravan, a white "panel van" and a Chevy van.
The other day I was home watching FOX News coverage of a roadblock on I-95/495, and they were pulling over ALL white trucks and vans. And from the sheer number of them, it occurred to me that seeing some kind of a white truck at the scene of these things may just be coincidence and not related at all to the shootings.