Flowers pay tribute to the victims of the train that crashed in northwestern Spain last week. The driver of the train was on the phone and traveling at nearly twice the speed limit, according to court papers. Rafa Rivas/AFP/Getty Images hide caption

itoggle caption Rafa Rivas/AFP/Getty Images

Tokyo Electric Power Co (TEPCO) workers work on waste water tanks at Japan's Fukushima Daiichi nuclear plant in the town of Okuma, Fukushima prefecture in Japan on June 12, 2013. Noboru Hashimoto /AFP/Getty Images hide caption

itoggle caption Noboru Hashimoto /AFP/Getty Images

Emergency personnel respond to the scene of a train derailment in Santiago de Compostela, Spain. Antonio Hernandez/El Correo Gallego via AP hide caption

itoggle caption Antonio Hernandez/El Correo Gallego via AP

Before a blaze broke out, a cloud of gas could be seen rising Tuesday from the Hercules 265 drilling rig off the coast of Louisiana. Bureau of Safety and Environmental Enforcement hide caption

itoggle caption Bureau of Safety and Environmental Enforcement

Debris left behind by the crash-landing of Asiana Flight 214, released by the NTSB this week. Police officials say a teenager who died at the airport was hit by a fire truck on the runway; she had been covered by firefighters' foam. NTSB hide caption

itoggle caption NTSB

Passengers move away from Asiana Airlines Flight 214 on Saturday in San Francisco. This photo was taken by a passenger. Eugene Anthony Rah/Reuters/Landov hide caption

itoggle caption Eugene Anthony Rah/Reuters/Landov

At a school in Lac-Mégantic, Quebec, the town's people have been waiting for word about their friends and family members. Christinne Muschi /Reuters /Landov hide caption

itoggle caption Christinne Muschi /Reuters /Landov

National Transportation Safety Board Chairman Deborah Hersman briefs reporters on Asiana Airlines Flight 214, which crash-landed at San Francisco International Airport on Saturday. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images