A speeding subway train has rammed into the back of another train off-loading passengers at a station in Rome, killing at least one person and injuring scores of others, five of them seriously.
Officials at the scene, just south of the city's main rail terminal, said there was no indication that terrorism played any part in Tuesday's crash.
Preliminary witness accounts said the driver of the second train may have run a warning light. But no official cause has been announced.
Television footage showed stunned passengers leaving the Piazza Vittorio Emanuele station as rescue vehicles arrived and departed.
Earlier reports had mentioned two fatalities. The revised figure was apparently due to confusion at the scene.
Some information for this report was provided by AFP, AP and Reuters.