A photo shows the wreckage of a train after a head-on collision between two trains, near Corato, in the southern Italian region of Puglia on July 12, 2016.
At least 20 people were killed in a head-on collision between two passenger trains, in one of the country's worst rail accidents in recent years. Investigators said at least one of the trains had been travelling very fast, and it was possible the collision was caused by human error. / AFP / MARIO LAPORTA (Photo credit should read MARIO LAPORTA/AFP/Getty Images)