Bulgarian firefighters work at the site where a train transporting gas derailed and exploded in the northeastern Bulgarian village of Hitrino on December 10, 2016. At least four people died and 23 were injured in the blast, emergency services said. Around 20 homes were smashed and many of the residents of the village of some 800 people were evacuated. / AFP / STR (Photo credit should read STR/AFP/Getty Images)
