A train carrying tank cars oil rolled out of control in Lac-Megantic, Quebec, on July 6, exploding in an inferno that killed at least 35 people. This is Canada's worst railway catastrophe in almost 150 years.
Lac-Megantic's devastated downtown remained dangerous for days after the crash as responders put out fires and struggled to keep the remaining oil tankers cool so they wouldn't explode. The hazardous conditions delayed the search for people missing -- and now for bodies. 24 people are confirmed dead and 30 more are missing.
Edward Burkhardt, the head of the train's U.S.-based parent company, blamed the engineer for failing to set the brakes properly before the unmanned Montreal, Maine & Atlantic Railway train hurtled down a seven-mile incline, derailed and ignited in the center of Lac-Megantic early Saturday.
The search for missing University of Virginia student Hannah Graham now includes the use of an aerial drone -- the first time, according to authorities, one has been used in the search for a missing person in the state.
Photos taken by scientists working for the National Oceanic and Atmospheric Administration show more than 35,000 walruses gathered, or hauled out, on a beach near the village of Point Lay, on the Chukchi Sea in northwest Alaska on Saturday.