1.   Beneath the ground, empty subways whisk through tunnels from concourse to concourse.

2.   Police investigators have said they are still at a loss to explain why Colecchia fired at Gaines on an empty subway platform.

3.   Prostitutes in seedy hotels bathe in between customers, lovers embrace in empty subway halls and hobos sleep under bridges over the Seine.

4.   One office worker told AFP he was about to go into an empty subway car at the Kasumigaseki station when a station guard shouted at him to stay away.