At the top picture I can see a train crush. Judging from the phote, the train has lost control and gone off the tracks.
The second picture shows the wrecking of some building. To my view point there took place and explosion. It's clear that on that picture the resque worker is looking for some people that may be under the destoyed parts of the building.
Both pictures show the accident scenes, but the second one on my mind seems to be more tragic.