Officials say that a truck may have triggered the collapse of a part of a bridge that sent vehicles and drivers tumbling into a frigid river in Washington state.<br/> <br />State officials say a semi-truck driven southbound struck the bridge just before part of it collapsed.<br/> <br />Two of the three people rescued from the river were hospitalized with hypothermia, but no one has died.<br/> <br />The freeway is a principal corridor for vehicles between Canada and Washington State.<br/> <br />Investigators are talking to the driver and inspecting the truck.
