LISBON, Portugal — An electric streetcar that is one of Lisbon’s landmarks and a big draw for tourists derailed Wednesday, killing 15 people and injuring 18 others, emergency services said.

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. An unknown number of the injured are foreigners, it said.

Authorities called it an accident, the worst in the city’s recent history.

The yellow-and-white streetcar, which goes up and down a steep downtown hill in tandem with one going the opposite way, was lying on its side on the narrow road that it travels along, Portuguese television channels showed.

Its sides and top were partially crumpled, and it appeared to have crashed into a building where the r

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