[dario]

Today, at 1137 GMT, a concrete slab was detached form the tunnel ceiling and fell on the third carriage of the train running by fate.
Having read about it in news.bbc.co.uk, this accident had a cause.
It seems likely it was caused by workers setting up a billboard in the streets who bored the ground!
That's almost incredible; how a stupid action can disrupt the quiet running of a Community.