Twenty people have been killed and dozens more hurt in a head-on collision involving two passenger trains in southern Italy, officials say.
The local authorities have appealed for blood donors to come forward.
It was unclear what led to the collision, which happened in good weather at 11:30 local time (09:30 GMT) in the southern region of Puglia.
A local prosecutor in nearby Trani said it was too early to speculate on the cause, although human error was likely to have been a factor.
'Worst scene of my life'
Both trains had four carriages and images from the fire service showed wreckage strewn across a large area. Some of the carriages were so badly damaged there was little left but debris.Corato Mayor Massimo Mazzilli said the damage was so extensive it was as if a plane had crashed.
"I saw dead people, others who were begging for help, people crying. The worst scene of my life," one policeman told journalists.
The trains were travelling at high speed
"The situation is dramatic," Antonio Nunziante, from the local civil defence, told Ansa news agency.
In total, about 200 were involved in the rescue operation, working in temperatures up to 40C (104F).
"I think we must have absolute clarity on this. We will not stop until we understand what happened."
Transport Minister Graziano Delrio was at the scene with ministry inspectors and local prosecutors to survey the wreckage.
The line, managed by Ferrotramviaria, is used by thousands of people daily on about 200 trains. Work is under way to make it a double-track line.
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