LISBON, Portugal (AP) — Portuguese officials focused Thursday on establishing the causes of the crash of a Lisbon streetcar popular with tourists that killed 16 people and injured 21, five of them seriously.

“The city needs answers,” Lisbon Mayor Carlos Moedas said in a televised statement about Wednesday's derailment .

The downtown streetcar, which is known as Elevador da Gloria and is a major attraction for tourists packing the Portuguese capital during the summer season, came off the rails during the evening rush hour. The crumpled wreckage was cordoned off as investigators sifted through the wreckage, took photographs and pulled up a metal cable from beneath the rails that climb one of Lisbon's steep hills.

Police, public prosecutors and government transport experts are investig

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