LISBON, Portugal — Portugal observed a national day of mourning Thursday, a day after a famous Lisbon streetcar derailed and killed 15 people in the capital's worst accident in recent history.

Authorities have given no information about those killed or the 23 that police said were injured in the accident, raising the initial casualty toll. The 19th-century streetcar is one of Lisbon's big tourist attractions and is usually packed with foreigners at this time of year for its short and picturesque trip up and down one of the city's steep hills.

Teams of pathologists at the National Forensics Institute, reinforced by colleagues from three other Portuguese cities, worked through the night on autopsies, officials said. The injured were admitted to several hospitals in the Lisbon region.

The

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