Wikipedia, Crush Syndrome, and You
The Wikipedia article indicated that amongst the causes of the high loss of life, was the design of the bridge, which was not cantilevered. A similar bridge design also caused the high lose of life in the Granville railway disaster in Australia in 1977.
Additional fatalities occurred during the Australian disaster because, as people who had been pinned down were freed, Crush Syndrome, a type of reperfusion injury, set in, allowing toxins which had built up and been trapped in the pinned sections of their bodies to become free and circulate into their blood supply, effectively poisoning them.
And that my friends is how I learn a ton of stuff about nothing at all.