At least 15 people were killed and 18 were injured after a funicular streetcar derailed and crashed in Lisbon, Portugal, authorities said Wednesday.

The crash took place on a popular streetcar line called the Elevador da Glória, a landmark located in central Lisbon and often visited by tourists. It opened in 1885.

Five of the injured are in serious condition, and a child is among the injured, the National Institute for Medical Emergencies said in a statement. Officials have not released the nationalities of all the victims. The State Department on Thursday confirmed that a U.S. citizen was among those killed in the derailment.

The cause of the crash remains unclear. Authorities called it an accident, the worst in the city's recent history.

Emergency teams work at the site of a dera

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